Who do I tell? Tax office?

[SufferingLampreys]

I started a new job today. I won't be doing much about 14 hours a month just above minimum wage so presumably won't be paying tax.
They're just paid me cash in hand which I wasn't expecting.

Do I need to let anyone know... Tax office etc?
I'm guessing I need to let tax credits know too (so that we can they can take practically all my earnings off our tax credits

They're just paid me cash in hand which I wasn't expecting.

They need to give you a wage slip, you have no rights if you accept cash in hand, so no tax credits, no sick pay and you become lost to the system.

Thanks I was thinking as much

Crap, how to make them

You could start by just asking for your payslip, they may(!) just not have written it out yet.