Question: cheap fun things to do on a rainy day?
Answer:  Go Trampolining. Londoners have gone nuts for trampolining with trampoline parks launching all over London. ... 
 Indoor Crazy Golf. Crazy golf is having a moment – and long overdue, for us kids of the 70s and 80s! ... 
 Social Boardgaming. ... 
 Learn to Skateboard at House of Vans.