You’ve had lots of nannies reply. Presumably you know that you’ll be an employer and need to register as one with HMRC?
But I would really recommend putting SSP only in the contract. That is the minimum you need to pay by law.
www.gov.uk/statutory-sick-pay
It means you can choose to pay more, but aren’t obligated to pay if your nanny seems to have a few random sick days. I have had a lot of friends who have had nannies take the piss and I haven’t.
You need to put holidays in the contact too and it’s best to split holiday 50/50 so that you choose half and they choose half. You must pay them for any time over that if you’re away but you can ask them to come in and do ‘nursery duties’.
Housework wise - I used to ask for the house to be as tidy as I left it. So kitchen wise-surfaces wipes, dishwasher filled and emptied of full, table clear and wiped, floor swept, dishes washed etc.
Mine were responsible for the children’s area - playrooms, bedrooms, laundry. These are nursery duties.
But nannies don’t do any heavy cleaning or bathrooms or clear up after you.
You are also responsible now for their pensions which can be quite complicated (although not too so if you do decide to set it up yourself - I set up our pre-school one without too much fuss).
I would recommend a payroll firm.
I would start with the contract on nannyjob and amend it
[https://www.nannyjob.co.uk/information/employment_contracts]
Other things may be important to you as well. We had a clause that no other people were allowed to be brought into the house without our written permission. IMO there is little point checking and DBS checking a nanny if she lets someone else into my house.
We also had a clause that allowed us to make a deduction from wages if she left without giving proper notice to allow us to reclaim fees for hiring a temp nanny. Again it prevented anyone leaving without giving proper contractual notice.,
I suppose the only other thing is that you need to make sure that your nanny feels welcomed and valued. It’s normal to buy her a birthday present and give a present/bonus at Christmas. As an employer too you have to give feedback, you can’t expect anyone to know exactly what and when you need something doing.