Re:
That’s an interesting point. There is a fair bit of information about Gillotts on Classic Lightweights and by the time your machine was built Ron Cooper may well have been the only remaining builder but I think that there were a number of other builders working at the beginning of the decade, Ron Cooper amongst them. So it could still be one of his!
You are right, they are lovely bikes; I’d be interested to see some pics of yours. You should start a thread.