TESCOAPP
In fact if they could be bothered producing a safety sense booklet on the differences it would make life alot easier for all concerned.
Have a look at the CAA website they HAVE been bothered and you can download "Safety Sense No26 (IIRC)"... i.e. everything you ever wanted to know when flying into a UK Mil a/f and were afraid to ask. (see link)
http://www.caa.co.uk/application.asp...detail&id=1476
Initials: varies a bit from place to place: traditionally it places the joining fast-jet around about 3-5 from the cct, either on centre-line but more typically offset on the deadside... 500' above cct height, so the pilot(s) can run in fast, sight the other circuit a/c, judge his/her break into the circuit and position in turn for landing. Some a/fs have low initials, where the a/c approaches below cct height so other a/c are more visible against the sky, in which case the pilot will pull up on the break to cct height.