Nah, buzzards have rounded, almost semi-circle tails, not forks like kites.
Another thing that can distinguish red kites is that do the birds have 'fingers'? Kites are identified, when in the air, by their five or so (on each wing) 'fingers' and two forked tail. Whilst buzzards don't have these 'fingers' (well, they do, but they're so short that you can't really distinguish them except through bins), and their tail is (as shown) like a semicircle Look at illustration two in the top right.
Oh, and listen to the red kite call (in archie's link)