just go for it, without doubt. all of above (with the exception of odd job man) is spot on.
but don't make mistake of putting up a small amount, in 10 years things have doubled, trebled, or even quadrupled in price. I would suggest putting it up by at least 30 or 40 percent, if you do a small increase it's a wasted opportunity. you have every reason to put price up, so make it worthwhile. nxt time (unless it's in another 10 years lol) you won't have excuse and be harder to get prices more up to where they should be.
also, love the 10 percent (or 1 pound, can't remember which it was) increase comment, I have 350 odd customers, would have 350 quid a month more approx, if I lost 5 (and that's very doubtful) I'd still be mega quids in, and as tosh pointed out. less work for it.