My house... built 1965 with MK wooden backboxes:
All of the lighting looked very original in 1994 when we moved in; with Crabtree flush switches (like a number of neighbours so I assume original) most of the sockets, apart from the kitchen, were surface mounted, looked like 3 sockets on the original ring with the rest as spurs.
I know metal back boxes were available before then, in 1961 we moved into a house and soon started replacing wooden patress mounted accessories with flush on metal backboxes. However the garage built in 1966 we used brand new wooden patress's with ceramic/bakelite switches and twin 3/0.029" (no earth) which are still there AFAIK.
I didn't realise they were still using red white blue 3 core as late as 1965, but during this time some people were still using the wooden back boxes with white plastic oval conduit - which seems strange, but the two items were available at the same time during this period.
