I was told by childminder that all I'd need is her early years childminder number and that tax credits would put it on the system and it'd come up her details. So I call them and do that and apparently they now don't take that number . Apparently now they only take name and address.
Not anyone would be registered though? They will have a list of childminders, anyone can ring up and just give a childminders name that's half the problem not enough checks are done to check they are actually using them.
Everytime you make a payment, make a note of it. Ideally have a reciept for each payment, or an invoice from your childminder. Also paying by cheque or bacs rather than in cash can help as then your bank statements show the payments as well.
It could well be the case that the registration number is not needed, the name and address of the childminder can be cross matched against data held by the childcare regulator (Ofsted if in England). About time that HMRC had direct access to Ofsted's regulatory support application.
You should make sure you have see the childminders registration certificate and made a note of their name, address and registration number.
You should also keep a copy of the contract, plus if any amendments are made to it, keep a copy of documentation regarding the changes, such as emails.