How does it compare with a childminder?
Lets say the childminder is £6 per hour, per child and does not give any deduction for when they or you are on holiday (In reality, if you went away at the same time as the childminder, then you may not pay anything for that period of time).
Lets say term time is 38 weeks and that you needed 1 hour in the morning and 4 hours in the afternoon for the 2 school aged children.
During Term Time:
School child: 5 hours x £6 per hour = £30 per day. 5 days = £150
Toddler: 10 hours x £6 per hour = £60. 5 days = £300.
Total per week: £600
School Holidays:
Per child: 10 hours x £6 per hour = £300
Total per week: £900
£600 x 38 = £22,800
£900 x 14 = £12,600
Total before additional expenses: £35,400
Compared with a nanny at £12.91 gross per hour:
£37,091.91 before additional expenses.
Lots of other things to consider though, such as the pros and cons of having someone come to your home. Children doing after school activities/clubs.