Nannyshare is the least expensive option.
The rate is £6 an hour this includes tax and insurance so this is what the rate would be over all.
So depending on the hours, but a typical day being 7.30 ~ 6.30 u would pay £66 a day, so £330 a week so it works out roughly £1,400 a month as monthly wages are worked out differently. But this includes tax and insurance for the nanny. so u wouldnt have anything else to pay extra..
So for a nanny her wages would be around £2.800 before tax and insurance is taken out.
Ur other option being, become a nanny yourself
Good luck