It's warming up a bit now.
Hertha - check AA travel before you transport these lunatics. If M25 has problems, go Bracknell, M3 and join M25 further down at J10 (I think it is), avoids the Heathrow bit. I always go this way anyway and plenty of piss stops around Bracknell.
He'll be on the road by now but I'll let him know. I always go M3 way when I go to Gatwick anyway so I know the route.