As a PP helpfully posted above. LGW has facilities available that don't require lying on a piss-soaked floor. That poster only linked to the LGW home page but it took me about 30 seconds to find the relevant info.
Methinks the lady doth protest too much.
https://www.gatwickairport.com/at-the-airport/passenger-services/special-assistance/facilities-and-services/
"We have two adult Changing Places located on the arrivals routes in both of our terminals. These facilities are available for all arriving passengers and include an adjustable bed that lowers to ground level, a hoist and flexible wash basins, within a large wash room with full shower facilities.
Changing Places are free to use and do not need to be pre-booked. There is a sign adjacent to the facility with a phone number to call to gain access. These facilities are clearly sign posted if you are an arriving passenger.
For departing passengers, we also have a small Changing Place located on the upper level of the South Terminal departure lounge with an adjustable bed and wash basin. However, if you are departing from North Terminal, we advise you to go to the Special assistance desk located in the departure lounge, where a member of the special assistance team will be happy to escort you to the facility which is on the arrivals route. Please allow plenty of time to get there.