I know where to get it overhere, in Holland, but UK is little bit more difficult to answer for me.
It seems there is dustribution in UK:
http://www.eurekafluidfilm.com/get/international.html
The German site:
http://www.fluidfilm.de/
I did business with them. I do not know whether they ship to UK though, because of the 'dangerous' contents what could give more hassle trough air.
Very convenient for bike use is an aerosol can AS-R. Comes with an nozzle with wich you can spray through the little ventholes and a very helpfull 60cm long nozzle is also avialable. About 10 euro for both, total. The oil is thick enough to not wash away in a bike frame, but like tectyl like products it will crawl forever between edges, old rust ...everywhere.
For compressor use there is also Liquid A and NAS. Liquid is very liquid, NAS is substantially less liquid. Btw AS-R is somewhere in between. NAS even might be heated a little.
Mike Sander is grease that needs to heated to 100 degrees celsius. At that temperature it is liquid enough to work with. You need a serious spraygun. Mike Sander is for the best protection in the very long run. Quite labourintensive, but it is a superb product. Honestly, for bike use you reasonably can expect FF AS-R will do.