(at around 55 mins) Just after the burglary the exterior shot shows a building with a high-gain UHF television aerial and an omni-directional VHF radio aerial, which are both very significantly post WWII. Also, there is a single insulated overhead electricity supply cable in an era when electricity supply would have been through twin uninsulated cables.
(at around 50 mins) The kitchen wall has a prominent pair of copper water pipes in an era when these water pipes would have been iron.