In my coming Sept trip to UK, I need to hire a car at Heathrow probably T3 and returning it at the same place 3 days later.
I did not have a good experience with Avis last year and really want to try other car rental company. However, I have the impression that Avis (and Budget) is the only company that you can collect (and return) your car at LHR (it was T5 last year) without needing to travel to somewhere away from the T3/T5 building by a shuttle bus. The reason I want to avoid this extra travelling is I shall have 3-4 large cases and do not really want to bring all these heavy cases onto the shuttle bus and then get them back, and reload into the rental car (which is going to be an estate, shall use some back seat space as well as there are only are only 3 of us travelling in the car including the driver).
Also, I get confused with all the car rental websites as most of them just refer me back to the same or similar agent which does not clearly say where the car collection location is or even tell me what the exact car rental company is.