Ended up paying more than expected.

We booked a Mercedes Vito but were given a Fiat. Later, we upgraded to an automatic Volkswagen Transporter for 7 people. The rental company demanded an exorbitant upgrade fee of 2000 pounds (an extra 190 pounds per day!) which was even more expensive than other companies' rental fees for a 9-seater automatic at the same time! However, since we had already paid for the manual car, we had to upgrade with them... The vehicle already had several scratches, but they weren't all recorded on the inspection sheet. When returning the car, the company charged us an additional 450 pounds for a minor scratch on the roof. It feels like this company exploits customers to claim insurance. Will never use this company again!

My rental company was Green Motion, not Carnect. The car was good, a Korean make. I originally booked a Volkswagen Golf, but they gave me the Korean car instead. This car might be more advanced than the Volkswagen Golf, making it easier to drive and more comfortable to ride in. Many roads in the UK are narrow, and its lane departure warning system was very useful for those of us not used to driving on the left. Additionally, Green Motion's pick-up and drop-off procedures were convenient, and the staff's service attitude was good.

The store is small, with only three staff members. The place where the cars are located is far from where you handle the paperwork. The signage is not obvious, it's in the hotel's parking lot. We had to look around for a long time. Very annoying!

Green Motion is generally very good, but the Heathrow branch is located at the Holiday Inn which is currently being used as an asylum seekers holding area by the government and feels very insecure. Be aware that the depot does NOT open at 06:00 as reported by Qeeq and Green Motion's website but at 07:00. Note also that there is no toilet on site and no shuttle service to/from the airport apart from the hotel Hoppa bus service which is infrequent.

Cars always exceed expectations, full option, clean great car, very long queue due to bank holiday which is understandable, people at the counter were friendly but of course they have to try to sell insurance, just make sure you know exactly what you want when you get there and you won't get more offers.