Welcome Chloe, I'm in London, so not that far away from you. First you want to have a good contract, medical emergency forms, picture permission forms and those are all the documents I use. I have a daily log book that I write in for each of the children for my own records but I just give the parents a verbal update at the end of the day, mostly for the first several months until they learn to trust me that their child is eating nutritiously.

I also tell the parents my plans for the weeks for field trips, park days, crafting days, etc. so they dress their children appropriately and I carry the medical forms with me everywhere we go.

If you would like to look at my contract I'd be happy to share since others helped me when I was getting started. But I only know how to send them by email if you would like to send that to me by pm I'll be happy to forward my forms so you can look at them and adapt them to your situation.

You will also need receipts of some kind for the parents, but I buy mine at the dollar store and they are duplicates so I have a copy after giving the parents their copies at the end of the year. Also, I recommend a website as a great tool to attract clients. Good luck.