Unplugged were very good at our wedding. Not sure if they’re the style you’re after, as there’re an acoustic 3 piece, but they are well worth considering. I believe they are resident at Opera Bar in The Gate (amongst other places), so you can ‘try before you buy’. They’re really well priced and play a wide range of popular songs and with enough notice, will try to learn any that you specifically want.
http://www.unpluggedacoustic.co.uk/
For a photographer we used Dan Yarrow. He’s based in North Shields and was also very good. A thoroughly nice chap who was able to commanded a large group of people very well on the day. He rides as well. Oh, yeah, he takes a good snap too! 😉
http://www.danyarrowphotography.com/