Reviews - Terminals Parking - Heathrow Airport

"excellent service. When booking, the prices vary considerably; I check all information but cannot work out why the cheapest is £20 less than the next one - there appears to be no significant difference - is there a difference in the service?? One review said the cheapest company required them to pay the £7 exit fee from the short stay car park after no extra time other than meeting and driving off - please always specify whether an exit charge has to be paid. "