Serial number points to Hodaka and 1992. I didn't realise they built RTS's there, but makes sense. Panteras and Avalanche frames with similar dates also available...
That first photo is taken in Norwich Cathedral Close. Number 71 is in the background, which was Norwich School's music department. Erpingham Gate is just out of sight on the right hand side.
Also, following for updates...
Just a request that if you do have an unknown bike, post up the frame number. In many cases it will pinpoint which factory the frame came from and often the year can also be deciphered.
A kilo would be incredibly light!
Seems likely your frame came from the same factory as @Peachy! Lotus's https://www.retrobike.co.uk/threads/lotus-sport-campagnolo-finished-pg24-xtr-finished-pg29.394429/