Hello. I thought I was relatively intelligent until it came to understanding taxes! After waiting over an hour to get through to HMRC I'm hoping a kind person can help me please! 
I have a job, which I earn slightly over the tax threshold for. I've taken on a second little side job cleaning a sports hall. It's a few hours per week & I'll earn around £50 per week.
Do I need to register as self employed now? I read I can claim back my cleaning products, do I just keep receipts for these? It's not my own business, just a way to earn some extra cash
I'm starting to think it may not be worth it in the end but giving it a try. The world of HMRC has left me confused!