There is a free shuttle bus from the airport, but the pick-up point at London Heathrow Airport was hard to find, and we had to wait a long time for the Europcar shuttle. The rental office is quite far from the airport. The car pickup was smooth overall; we booked an Audi A4 but received a Mercedes C-Class. The staff didn't try to upsell anything, but they also didn't provide detailed information on driving rules and other considerations.