The Man Who Knew Too Much filmed at St Saviour's Church Hall, London. This church hall served as the chapel where the kidnapped son is held. The hall has since been demolished. On screen it's Ambrose Chapel.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
Planning the trip? The United Kingdom travel atlas covers money, language and getting aroundand everything filmed in London is on one page
Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in London and it tells you what was shot around you, how to get there, and whether you can actually go in.
Download Venture for iOS Android