Slough House on screen
Jackson Lamb’s department has its television frontage at 126 Aldersgate Street, beside the Barbican. Londonist identifies these offices as the exterior used since Series 1. Arriving on foot captures the appeal of the setting: the headquarters of a secret intelligence department sits above a restaurant on an ordinary London street. Look up and the familiar upper windows bring Lamb, River and Catherine’s workplace straight back into view.
Time Out’s Series 4 location guide identifies Aldersgate Street in episodes 1–6. The building supplies the outward face of the office throughout that series, while the drama moves between the department, the Park and River’s family. This is an establishing location rather than the rooms in which the cast perform their desk scenes. The pavement is the place to enjoy the recognisable exterior.
Front, rear and interiors
The television building combines three separate places. Supervising location manager Ian Pollington confirms that Aldersgate Street provides the front and a service yard on St John Street supplies the rear alleyway. Time Out identifies the interior sets at OMA X studios in Enfield. Editing joins frontage, fire escape and office into one convincing workplace, keeping the audience’s attention on the characters rather than the journey between production sites.
That split makes the nearby St John Street exterior an especially useful second stop. Compare the busy road outside the front with the more enclosed rear setting used for entrances and escapes. Lamb’s staff seem to move around a single cramped building; the production creates that impression from streets with different surroundings. Seeing both areas is a satisfying way to understand the show’s London geography.
What you can see from the pavement
The frontage is narrow, with pale brickwork and rows of upper sash windows. Londonist’s photograph shows how the offices sit above the ground-floor restaurant. The upper floors are the most useful details to compare with screen images: they give the building its recognisable shape even as businesses and street furniture change around it. Start with a view of the whole elevation, then pick out the windows.
For photographs, stand back enough to include the roofline and neighbouring buildings. A close crop of a doorway loses the contrast that makes this location memorable: Slough House is squeezed into the fabric of a working street. The opposite pavement gives a wider perspective. Use the pedestrian crossings when changing sides, and leave room for other people to pass while framing your picture.
Plan the visit
Barbican station · 3 min walk
Leave Barbican station onto Aldersgate Street and turn left, heading north towards the Carthusian Street junction. Continue along Aldersgate Street to number 126 and look above the ground-floor restaurant. Allow about three minutes from the station exit, including time to orientate yourself and use a crossing for your preferred viewpoint. Barbican serves the Circle, Hammersmith & City and Metropolitan lines.
Farringdon station · 8 min walk
From the Cowcross Street exit, head east along Cowcross Street to St John Street. Turn left, then right into Charterhouse Street and continue towards Charterhouse Square. Follow the route east through the square to Carthusian Street, which meets Aldersgate Street; turn left for number 126. Allow about eight minutes. From Farringdon’s eastern Elizabeth line exit on Long Lane, walk east to Aldersgate Street, turn left and continue north; this shorter approach takes about three minutes.
Accessibility
For a step-free arrival, plan around Farringdon and the entrance serving your train. TfL’s guide distinguishes Barbican’s westbound access from its eastbound platform: the westbound step-free connection uses a 140-metre street route to Farringdon’s Long Lane entrance. Farringdon’s Elizabeth line entrance therefore gives a practical starting point close to the frontage. Check the live lift status before travelling and keep to the street-level route.
Coffee, pub and best time to visit
Urban Baristas at the Barbican Cinema Café is on Beech Street, a short eastward walk from Aldersgate Street. It offers coffee, pastries, bagels and wraps, making it a convenient pause before continuing towards the estate. For a pub stop, the Sutton Arms is at 6 Carthusian Street, close to the Farringdon approach. Its traditional setting suits a slower break after photographing the offices.
Daylight is best for comparing the windows and brickwork with the television exterior. A morning visit leaves time to combine the frontage with coffee and a longer walk; a late-afternoon stop fits comfortably before a pub visit. Build the outing around the walking route you want to take, with a few minutes at the building rather than making it the whole day’s destination.
Nearby locations to combine on foot
Walk west via Carthusian Street and Charterhouse Square towards the St John Street rear exterior. Alternatively, head east along Beech Street and Chiswell Street, then turn north into Bunhill Row for Bunhill Fields, used by the production in the first series. This makes a useful progression from the familiar office to a different London setting, with the Barbican’s streets linking the two.
Good to know: Keep the visit to the public pavement and leave entrances clear.
Location evidence
Confirmed: Film London’s interview with Ian Pollington establishes the split exterior. Reported: Time Out lists the Aldersgate frontage across Series 4’s six episodes, and Londonist documents its continuing use and photographs the building. Composite: Slough House joins that frontage, the St John Street rear and Enfield interior sets into one screen address.