As I write this, we have had close on two weeks of gorgeous, sunny, hot weather. The end of April is often, in my experience, warm and sunny. But it isn't usually so hot. Is this is a sign of the summer to come? I can hardly dare hope. But it wouldn't hurt to be prepared.
What you need is a paddling pool. A garden toy like this Nursery Play Centre with Ball Ramp is a great way to cool little ones down when it gets too hot.
Made of vinyl, the pool measures 159cm high by 159cm wide and 89cm deep. Although there's not a lot of information on the website, it is available elsewhere. According to another site, it has a ring toss with three inflatable rings included, and an inflatable ball ramp to roll balls up and down. Six game balls are also included. It comes with a repair patch kit.
Thanks to Sliwka at HUKD!