They moved to Harpendon and thats where they folded.I worked for Hilmore up in Stevenage Herts Caxton way before i joined the army in 78,i'm pretty sure they're not there anymore
I think the problem with most British tool manufacturers is they were victims of their own success. Once everyone had one they didn't ever fail or break so never needed another which means no more sales.
Apart from steam locomotives what other mechanical machines are still being used today 50 plus years after production?