While we're on the subject of RT I have to say I like the American way of communicating in the circuit by prefacing their calls with the aircraft type and then call-sign e.g. 'Cessna 172 G-ABCD (N123) left base 21'. This gives you a clue as to what to look for and some idea of the likely speed. I know this probably takes a millisecond more of air time and also requires some knowledge of aircraft types; but I like it!
I agree.
Prefacing with type of aircraft is great, because not only does it inform your fellow pilots what aircraft to look for and what performance your likely to have, but it adds two more benefits: ATC can now separate visually by saying "you're number 2 after a Seneca on short final", rather than having to look that info up. Also, you can now (although not strictly correct), abbreviate by saying "Seneca turning base" etc in high workload airspace. It saves time. N- or G-numbers have very little use in spotting traffic.