As far as I know they were never sold in the UK, we got the Ford Cortina which was produced in England. My dad bought a new one in 1966, I remember it well (I was 8) and it was still on the road locally till the late 70s. Mk 1 Cortinas were everywhere in the 70s but like the Taunus they're now a very rare sight, only seen at car shows.
The Taunus is in amazing condition and that's down to the storage conditions. As for re-commissioning, good luck! I bet you end up stripping and rebuilding the carburettor to make it run correctly. Regarding the fuel tank, it may be worth trying to seal it after draining, there used to be a product made for this and it supposedly seals any rust to prevent it flaking.
I`m sure you'll replace those cross-ply tyres, haven`t seen any like that for many years!