Europcar Heathrow branch (accessible by shuttle bus).

Excellent

Overall satisfactory. Due to a 15-hour flight delay, the staff first commented on my luggage volume, then claimed my insurance didn't cover it, but I declined both.

Like: Service staff AMINAH at London Heathrow pick up was excellent. Friendly and efficient...even though it was near Christmas and I arrived at a time when the colleagues were going to take a group photo, she helped out immediately and was very friendly and helpful. Good job Aminah and thank you!
Dislike: Returning the car was a pain. There was no transport back to civilisation. I had to struggle to get out. If there was a courtesy bus back to the Terminals, nobody told me!!!! I walked and walked to find a bus stop to my hotel.