I think Mr Marvel covers that area. There are actually about 5 of them and each has a different patch. They do the usual silly magic and jokes with loads of joinong in for the kids, he will then get the all sitting for the tea and will start off the singing when its time for the cake and then he'll have a disco with bubble machine so that they can run it all off before home! He's wonderful -we see him at a few parties round here and hes great. There is a website http://www.mrmarvel.co.uk
We have been to a couple of parties run by "Stretch and Grow" which have been great. The woman comes to ds' nursery every fortnight and takes a class so people have booked her for parties and they all seem to love it. I dont have contact details but I could find out if you are interested.