Originally Posted by
jamiel
I presumed that a highway journey between LGW and LHR might pass by one of these facilities, which would easily and safely accommodate my suggestion.
There is a highway. There is one service station en route, at cobham. Free parking for 3 hours
https://extraservices.co.uk/facilities/parking/
By the time you pay for the hire car and the parking you are paying a similar amount to the comfortable hotel to sleep in your car.