Aviator (servisair) do the ramp and dispatch at lgw. Check in is done by swissport.
Aviator are only subcontracted by Swissport at LGW to Ramp handle FR, it is supposed to be handed over to Swissport at the end of this month , but with all the other issues with Swissport at LGW at the moment I wouldn't be surprised if this agreement is extended until everything is sorted out.....