Mentioned by Santorini Dave
London with Kids - The Best TOURS & THINGS TO DO
"London Zoo sits in the northern part of Regent’s Park and is extremely popular with families. Wildlife habitats include Tiger Territory, Gorilla Kingdom, Land of the Lions, Penguin Beach and Reptile House (where part of a Harry Potter film was shot). Meet the Monkeys is a big hit with younger kids and you can visit creepie crawlies in the spider walkthrough."