I have a 9 month old, and am not going back to work until she is 1, but a friend with an 8 month old is going back to work next week. I offered to look after him as she was really worried about leaving him with strangers, so we have agreed that for the 2 days a week I will take my DD to her house for the 8 hours and look after them both there. She said she will give me £50 per week as she doesn't want to feel she's taking advantage, and also knows I have been a bit tight on money (am a single mum)
Does this count as work or is it just babysitting as it's nothing formal?