More newbie questions

1. N reg. Disco XS 300TDi - is there a way I can visually check if this has had the cambelt mod that is talked about for this model?

1. Does anybody know of a worthwhile warranty company that will give a warranty on vehicle above?

2. Is an RAC/AA inspection worth the money? Are there other organisations that do these checks?

1. Anybody here from County Durham who has years of experience and will come with me to check a Discovery out - expenses paid? cheers Gary

(As you might be able to tell, I've found a car I really like the look of, but don't know enough to decide if I'm getting a lemon)