Mate, you will love them, they're such good showmen and know how to please a crowd. You'll like the bit where they change genres constantly for about 10 minutes, that's brilliant!
Don't know who the support is this year but it was Big D & The Kids' Table last year, they were really good as well. There was another fairly big ska act on before them as well, but I missed them due to drinking excessively in the Crystal Palace before the gig.