I'm not usually lazy about research, which I enjoy, and I rarely find myself struggling to identify a prototype I'd like to tackle in either 'straight' or fictionalised form.   In the case of the Brighton, however, I find my enthusiasm for the company far out strips my meagre knowledge and I look at the web of green lines stretching out to the south of London in my pre-grouping atlas with a growing sense of confusion.   In short, I would be grateful for any suggestions for a suitable basis f