I don't usually venture onto 'local', but having just had a really great party for DS(4), thought I'd come on and praise 'Tots to Tens' in Hillsborough.
They were great - cheap, friendly, and huge fun for 8 4-year-olds to run around and use up some of their energy. Food was just right (we did have the 'healthy option', adding in some carrot batons, raisins and cucumber to the sandwiches and crisps) and I honestly couldn't have had a more stress-free time.
I don't work for them, I will say on the downside it is really getting shabby and a bit dirty in places, but it's so friendly. So there, a recommendation