I am a c/m in St Albans, each child would be £5 -£6 an hour and most have a minimum charge for after school. I pick up from 2 schools.
My DD used to pick a child up from school when she was in the 6th form (from the the Junior House) walk her home and cook tea, she was paid £6 an hour and that was 5 years ago.
Nannies are £9 - £10 an hour,for afterschool hpurs, and difficult to find, but cheaper for full time £8 an hour, look at Tinies website for details.
Which school? I might know a childminder who does a pick up as I mentor new childmnders and have been a minder in St Albans for 22 years!
Other places, the notice board in the children's centre, Church Crescent or one near to where you live.
Ask the school secretary for the list of minders who pick up and drop off, most schools are part of the scheme, I can tell if your is.
You need a young 'granny' type person who would like contact with children and a bit of income and has had experience of own children etc, who might even do your ironing - just what my sprightly neighbour does!