My son had a birthday party at Splash Zone Gulliver's Park Milton Keynes few months ago. When I booked this party I spoke to Manager of this place and I was told that I should not be worry of anything that everything would be good organized and there would be professional people who take care of all the party. In practice it simply was a lie. The place where children ate was hardly decorated, the one guy who was supposed to entertain children walked out few times disappearing every time for few minutes leaving children bored and without any supervise, which was not safe at all. When he was with children to be honest he looked lost and was not able to entertain them at all. At the end he took my cake wrapped in foil exactly how I had left it with them (I was ensured the cake would be prepared and nice serve to children) Everything I had to do myself even entertain children which were bored. It was embarrassing, I was not prepared for this especially that I was heavily pregnant at that time.
In my opinion they have a lot of lies on their website about professional and amazing birthday parties. Maybe someone else has different experience, mine was not pleasant at all.
I made a complain, sent the letter twice and no one even bothered to make a reply. That makes me think they just do not mind if their clients happy or not with their service.
At the end I can say that the play area is really nice and probably it is worth to go there with children for play time but for sure they are rubbish in organizing birthday parties.
I hope others have different experiences.