I was starting to think that i should have asked 'where was your frame made?' but actually this is more interesting.
it's interesting in the sense of a cycling boom and that prices, at least mid level and above, must now be conducive to UK manufacturing.....but I'd guess that the tooling up and cost of breaking into a market would still be prohibitive.
I know where most of my stuff comes from but wouldn't have a scooby on the raw materials, of my 4 frames 2 were welded in Russia, one in the UK and one in the US. Powdercoating is two in UK and 1 in US and 1 no paint...but where is the powdercoat itself manufactured and where did the tubing for the frames come from? Looking at my components then it's pretty multicultural but again I don't know sources for raw materials or where all manufacturing of bits takes place, my rough list is:-
Germany - Rohloff, SON, Supernova, Ortlieb, Schwalbe
France - Mavic
Russia - Burls frame building
UK - Brooks, Hope, Wheelcraft, TaylormadeBikes, Burls Design, Aurora Powdercoatings
US - Thomson, Bike Friday
Asia - Shimano, Topeak, On-One, Surly, Superstar, Avid, Rockshox, Salsa, Goodridge
That pretty much covers what I'm aware of but I certainly don't know the full supply chain