A lot of the brands mentioned may have disappeared from the UK market, but are still going strong elsewhere, or like Onza, Vitus, Nukeproof and others, have been bought by bike shops and are used by them as brands.
For Trek and buying brands add Lemond to that, they totally killed that brand, as well as Klein, Gary Fisher has become a bit marketing term for the geometry, and they have done pretty decent job with the Bontrager brand, although it has nothing to do with what Bontys were BITD.
Add Parkpre (bikes) Bullseye, Kooka, Clark Kent, MachineTech and many others to the list of MIA brands