Trygon Factor, The (Das Geheimnis der weißen Nonne)

Detective Thompson (Allan Cuthbertson) approaches Emberday Hall. The entrance to Strawberry Hill House on Waldegrave Road in Twickenham, Greater London. The location also appears in 'Eat the Rich'.

Looking rather resplendent in white, Antony Blair (AB) faces the sun to capture a similar view of the property.

Looking for his contact while investigating a series of robberies, the Detective makes his way around the part of the building that houses a convent. Strawberry Hill House is now occupied by St. Mary's College and is a location that can also be seen in 'Father Brown', 'Bullseye!', 'Villain', 'Eat the Rich' and 'Personal Affair'.

Antony wonders if the gardener has planted those trees in the wrong place!

Seeing less than 'nun like' activity through a window, another entrance is sought. Strawberry Hill House, St. Mary's College in Strawberry Hill, Twickenham.

The back of the grand house, and more trees! (AB)

Thompson makes his way up a set of steps in the hope of discovering a way in. St. Mary's College in Strawberry Hill.

The rear staircase and tower as they look today. (AB)

Having no luck, Detective Thompson returns to the grounds to continue searching for his contact, Sister Clare O'Connor. St. Mary's College in Twickenham, Greater London.

A Black Nun (Richardina Jackson) and a White Nun (Caroline Blakiston) discover Thompson and question him before leading the intruder to his death in the chapel. St. Mary's College on Waldegrave Road, Twickenham.

The same screen at St. Mary's University College. (AB)

Following Thompson's disappearance, Superintendent Cooper-Smith (Stewart Granger) and Inspector Dice (Colin Gordon) arrive at the hall to question Livia Emberday. Saint Mary's University College on Waldegrave Road, Twickenham.

Looking along the back of the property which once belonged to Horace Walpole. (AB)

Mourners Livia Emberday, her son Luke and daughter Trudy along with Hubert Hamlyn follow a coffin containing Emil Clossen towards the family vault. The long demolished balustrade and pavilion stood alongside the River Ash in Littleton Park, Surrey and also features in 'Witchcraft', 'The Asphyx', 'The Oblong Box', 'A French Mistress', 'Follow Me' and 'Whoever Slew Auntie Roo?'.

Escaping from the convent, Clare O'Connor looks out of her room window at the White Hart Hotel before a masked Assailant breaks in and drowns her in the bath. Steve Randall found that Ethel Taylor's greengrocers shop, on the right, stood at 8 London Road in Chertsey, Surrey adding that the business survived until 2009. The view seems to be from the Crown Hotel opposite.

Nick Boorman couldn't get the height and adds "The roof line is the main identifier here but the next door property has been demolished to make way for an access road."

As Livia Embarday finalises the plans for the latest bank robbery with Emil, Cooper-Smith arrives at Hamlyn's Wharf to question Hubert. St. Katharine Docks in London E1.

How times have changed. (RL)

The Inspector's Aston Martin DB6 comes to a halt outside the outwardly respectful businessman's warehouse. Looking across St. Katharine Docks towards the Commodity Quay standing to the left.

Now. (RL)

Nailer (Yuri Borienko) gets into his lorry outside the warehouse. The Commodity Quay at St. Katharine Docks.

The original war torn building was demolished in the early 1970's in favour of what is now International House. (RL)

The Bedford TK leaves the wharf. Looking into St. Katharine Docks from East Smithfield with Tower Bridge visible above the warehouse roof line.

Superintendent Cooper-Smith returns to Hamlyn's Wharf with a search warrant. St. Katharine Docks are also seen in 'Attack on the Iron Coast', 'The Buttercup Chain', 'To The Devil A Daughter', 'The Long Good Friday', 'The Diplomatic Corpse', 'To Sir, with Love', 'Man of Violence', 'Mrs Brown You've Got a Lovely Daughter' and 'Hunted'.

The camera pans with the cars as they draw to a halt. St. Katharine Docks, see post-script at the bottom of the page for additional information.

Officers get out of their cars to begin searching the warehouse. Looking out from the Commodity Quay, also known as C Warehouse, towards the Ivory House at St. Katharine Docks E1.

As the Superintendent and his Men search the Hamlyn's warehouse, the White Nun calls Livia Emberday to let her kow that the robbery of the National & Mercantile Bank is about to commence. Outside Adams Court on Old Broad Street EC2 with the dome of the former London Stock Exchange awaiting destruction to the top left of centre

The view from Adams Court and the likely prop box of part of the 125 Old Broad Street development. SJ

The Nuns wait across the street as, inside the bank, Emil uses an inovative method to crack open the safe containing gold bars. Old Broad Street with Adams Court to the left.

Adams Court has been rebuilt and the police security box added as Peter's comparison shows.

A Policeman approaches the gang's armoured van as it waits for gold to be delivered from the bank. facing north-east on Old Broad Street.

Peter captured Old Broad Street, London EC2. Virtually unchanged but the post box has disappeared.

In her Ford Zodiac Estate, Trudy Emberday (Susan Hampshire) parks up across the road from the bank. Old Broad Street in EC2 with the Clock Tower of the Royal Exchange in the top distance.

The same location now by Peter.

One of the Gang Members (Tom Bowman) glances towards Trudy's car. Looking south-west along Old Broad Street.

One can just make out the Tower at the rear of The Royal Exchange which is more prominent in the original. SJ

After the Policeman moves on, Trudy watches the bullion being carried to the security van. Old Broad Street with the entrance to Austin Friars on the left.

Peter found that Austin Friars is still the same with the addition of a Max Headroom sign.

The last of the gold is loaded. Facing the corner of Throgmorton Street on Old Broad Street EC2.

Austin Friars is the only original part seen in the screen capture. Image from Peter.

With the bullion and all of the imposter Security Guards inside, Pasco (Conrad Monk) locks the door of the security van. Now, that background isn't in EC2.

Pasco drives the van from the scene. Aldwych WC2 with Australia House on the left. The area appears in 'No Place for Jennifer', 'Go to Blazes', 'Castaway', 'The List of Adrian Messenger', 'The Common Touch', 'Nobody Runs Forever' and 'Final Appointment'.

Peter notes that the zebra crossing has been replaced by traffic lights.

The camera follows the Morris J2. Facing Strand in WC2 with the now lost Norfolk Street to the left of centre.

The only buildings not rebuilt are in the right background. The lamp standard on the left of picture is the same and roughly where Norfolk Street was. Image and information from Peter.

Pasco closes a ventilation lever and turns on a tap which releases poisonous gas into the back of the van. Facing southward on Aldwych in WC2.

Busy with buses. SJ

The rather circuitous journey to Emberday Hall continues. Aldwych with St. Clement Danes church in the right distance.

Even in winter, St. Clement Danes lurks behind trees. SJ

Trudy picks up Sister General and Emil from outside the bank and drives them to Hamlyn's Wharf. The northern roadway of St. Katharine Docks that follows East Smithfield, behind the wall to the left.

As police cars appear from the gateway Trudy continues past the wharf. Looking towards the Ivory House, also known as I Warehouse.

Reversing out of a side road when the coast is clear, Trudy drives to Hamlyn's warehouse. Facing the back of the Commodity Quay at St. Katharine Docks.

After the bodies of the dead Guards are dumped in a river, the security can is loaded into a pantechnicon. The footbridge over the River Ash in Shepperton Studios' Littleton Park. The bridge can also be seen in 'Dr. Terror's House of Horrors', 'The House That Dripped Blood', 'Daleks - Invasion Earth 2150 AD', 'Every Day’s a Holiday' and 'Monster of Terror'.

As Trudy and Sister General dispose of Emil, the Superintendent sends a patrol back to Hamlyn's Wharf after hearing of the robbery at the National & Mercantile Bank. Looking across West Dock from beneath the Commodity Quay at St. Katharine Docks E1.

Hubert Hamlyn looks from his warehouse and spots the parked police car on the far side of the dock. St. Katharine Docks, which have since been substantially redeveloped.

As Hubert drives to Limehouse pier in the Zodiac, Trudy and Sister General take to the water. In the right background stands the Commodity Quay warehouse that backs onto East Smithfield E1.

A speedboat appears from beneath Hamlyn's warehouse. The West Dock of St. Katharine Docks with the Pump House in the right background.

The speedboat leaves the dock as the pair head for Limehouse where they meet Hubert before going on to Emberday Hall. St. Katharine Docks E1.

At Emberday Hall, Sister General (Brigitte Horney) and Livia Emberday (Cathleen Nesbitt) confront Sophie (Sophie Hardy) after her son Luke (James Culliford) finds her snooping around the grounds looking for Cooper-Smith.

As a post script, Ray Glenister provides, courtesy of Ordnance Survey, the camera locations for various screen captures as indicated by the red numbers. The blue dotted line represents the movement of the car from capture 29 to 30 and 31. It would be difficult now to produce comparison shots due to subsequent development. (RL)