I am indeed "one of these harmony people". And the person you are thinking of is Graham O'Callaghan, who will certainly be at Sidmouth, and almost certainly at Whitby too. I believe the original group has re-formed, so keep your ears open for them, they might be better than ever.
And I agree with Countess Richard, Broadstairs is a charming place, and the town really seems to make the most of having a festival (at least it did last time I went!). Why not save up and try to get to more than one, even if it just for a weekend?
saro