Our situation with nanny is thus:
She works 1 day a week for other family (9 hrs at £10pph = 90 pounds, no tax), she used to work for them for much more hours.
She is with us 3 days a week for 11hrs per day. (total 33hrs = 330 per week)
They are her first employers. We are the second employers.
How should the tax allowance split fairly please?