Sorry, I forgot to put that part in.

I collect the car Sunday 26th August and return it Thursday 6th Sept, so a total of 12 days.

I'll be driving down to Devon, then back to London, down to the South Coast and then up to the Birmingham area, before driving back to Heathrow.
There will be four of us with a fair amount of luggage. My friends have never been to the UK so I want to make sure we have a comfortable trip.