How much..?

[saya]

My DD school is 20mins drive form our house, my husband and I work work full time, therefore school runs will be a proble from September.
A friend offered to do the drop off and pick ups for us:
she will drop her 2 mornings and pick her up 5 afternoons, she doesnt have to look after her as my parents will do that, its purely driving her to school and bring her back. Eventhough she is a friend, I would like to pay her but dont know how much so can anyone please advice whats a rate for school escort...
Many thanks

This from National Care Share may be relevant. The potential problem is that your friend's car insurance will most likely not permit them to transport paying passengers (hire & reward).

As long as "the total contributions received for the journey concerned do not involve an element of profit" then the Association of British Insurers seems happy with a payment being made by a passenger to the car owner.

Can you do something for her in return? Provide goods or services?

I knew someone who did something similar and she worked in a commercial bakery. She would often bring large trays of cakes/Danish pastries.

Expenses for travel - HMRC 0.45 p per mile. This covers petrol, wear and tear etc.
We travel 20 minutes to school which is @ 7 miles each way. So for a return journey £6.30 in expenses. For your 7 journeys equals £44 per week.
So surely you can give her this to cover her expense and then maybe just invite her to dinner or something so it is not classed as taxi service.