Party Entertainer - SW London - 4 yr olds

[RosieIrene]

Any recommendations for a party entertainer for SW London for small group of 4 year olds for party at home? Someone who can do something with Pirates/Princesses as dd wants to dress as a princess but do pirate things e.g hunt for treasure!

The Action Station get recommended a lot on here and start at 4 (haven't used them myself as DS is only 3, but have them bookmarked...)