You are way better off buying a new white unibody MacBook from Apple, or refurb from Apple (with 1 year warranty).
I like the blackbook, but £699 was what I paid for my 2.4GHz blackbook refurb in late 2008 (gotta be worth less now). and they're selling a 2.16GHz one, must be from early 2007??
Black is nice, but you gotta have some sense, don't you?