There's also toddler world at botwell in hayes town centre on Monday and Wednesday this week. Really cheap and fun for kids
There is a place called Myllet Arms pub in Greenford. They have a large playarea for kids. I normally take my kids there to play while I chill and enjoy good pub grub and the best thing is that the playarea is free of charge x
Hey Alisha, I just posted about a meet up in Heathrow. A bit further but will be there anyway if you fancy