Re: Thanks for the video Alastair
There are prefabs left all over the place, and in some cases they are highly sought-after as in general they were designed with decently-sized rooms and generous gardens. What they are not, often, is adaptable.
Just here in Caerphilly there are loads of the things. Google maps references follow:
Here's a whole close of the things, bungalow style, at the time of writing one of the ones in that linked view still has the original corrugated tin walls, though the roof has been covered with what looks like standard concrete tiles, but I know for a fact is actually some kind of rubbery stuff that came on rolls. Here is another street, just up the road.
These streets nearby are "Cornish" pattern prefabs made from prestressed concrete panels with Mansard roofs. Again, I've parked you outside the only one which still shows the original panels - all the others have had cosmetic cladding added. There are thousands more such buildings in use around the country.
In certain parts of the country, prefabricated places of worship were common from the late 1800s onwards and many of these Tin Tabernacles are still in use. Here's one in the Rhondda, Here's another North of Bridgend, and this one - just around the corner from all those prefab houses - I know a little about. The original prefabricated hut came down from Liverpool by train, delivered to the station that gives the road it sits on its name. The place has had two large conventional extensions - one in the 1960s, the other more recently - and the original corrugated iron has been replaced with coated steel panels, but the wooden structure is still there and the place is still in use.
There are even a few - houses and chapels - in museums:
St Fagans Museum in Cardiff has a postwar prefab on display in a slightly different style, as does Avoncroft museum near Bromsgrove which also holds a Tin Tabernacle. The Black Country Museum in Dudley has - believe it or not - a pair of prefab houses built from cast iron panels. Just imagine trying to drill through the wall to fit an outside socket! Blists Hill in the Ironbridge Gorge has a Tin tabernacle too.
And in finding all those links, I've also just discovered the Prefab Museum. There simply had to be one :-)
P.S. Avoncroft also holds the National Telephone Kiosk Collection along with a working Strowger exchange enabling you to make calls between the boxes. There's even a TARDIS-like police box.