G-BPEI was the aircraft called 'Winchester Castle' and being a resident of said City it is not an impressive building to see (or work in)
There was also a 747 named City of Winchester though (BDXD)
BA also had Tristars named after Roses (flowers not the chocolates). Some Bac 1-11 were named after counties. British Airtours 737's were named after birds (callsign was Kestrel at the time)