Les vaincus

I recently saw this film for the first time, directed by Italian director Michelanegelo Antonioni in 1953, and have a number of questions that I hope forum members may be able to answer. The film has three stories of murder committed by juvenile delinquents, and includes one shot in England with English actors and locations. The main actors featured are Peter Reynolds, Patrick Barr, Fay Compton, Eileen Moore & Raymond Lovell and most of the half-hour of screenplay is shot on location in London.

My first question concerns the sound track. The DVD copy I saw claims to have the original soundtrack, but it seems that the actor's words have been dubbed in after shooting - possibly a necessity in view of the large amount of exterior location footage. Raymond Lovell's "voice" is clearly not his - no hint of his easily recognizable lisp or slight accent. The other actor's would appear to be correct - as this was Lovell's last film role, perhaps he was deceased before the voice - overs had been completed? Also, does anybody know where the interior shots were filmed? There are a few, inside a newspaper office, in a court room and a house - were these filmed at a studio in the UK, and if so, which? I couldn't find any info about this at IMDb.

For those who like location footage of London this is a must see. As well as shots at Piccadilly Circus and other central London locations, there is also an excellent shot taken at the junction of Carshalton Road with Sutton High Street - identifiable because the names of both roads can be easily read. Lots of buses, cars and motor vehicles can be seen in clear detail, as well as shots at (presumably) Piccadilly Circus underground station.

Hopefully someone here will have some more information about the filming of the English segment of this film,