Looking for an Au Pair

Do you mean you want an actual au pair to live in as part if the family?
Will they be responsible for the kids at home after school?

So you need a taxi service then, not an au pair

I dont think you are looking for an au pair, ie a foreign girl to live in, have english lessons , and help with the children. You are looking for a mothers help/part time nanny if child care is involved. There are agencies who may have the right person

Well that's not an au pair. There are strict guidelines about hiring au pairs.
As pp. said you need a taxi. Many taxis are dbs certified and already transport kids to and from school maybe one has space for your kids?

Nomore
Op just wants someone to walk her kids home no.childcare after that. She will be lucky to get someone to just work a short time every day and reduce thier earning potential with other childcare work.

Is there a reason you cant do it? Some childminders will if your disabled/Ill.