Part time Nanny in Barnet, London

BARNET (near Barnet Hospital)
Previous clients of ours are searching for a nanny to work the following days/hours:
Friday and Saturday 7am to 7pm with at least one evening's babysitting on one of the nights
Sunday morning 7-12 would be a bonus!
Children aged 2 and 3 years
Salary is £15-18 gross an hour
Parents are around some of the time but happy for nanny to take sole charge
Can be live in Thursday pm to Sunday pm OR live out - separate accommodation for nanny if live in
Driver preferred