Colomor is very much alive and kicking. I've bought from their webshop quite a number of times, which I think is now their sole trading vehicle.
Companies House says
https://beta.companieshouse.gov.uk/c...07353/officers .
There is also Langrex, also in West Sussex
https://www.langrex.co.uk/contact/ . I've bought a bunch of obscure and often period valve bases from them.
Craig