From Heathrow Airport to Edinburgh, then Scottish Highlands, and Return to Euston Station in London

The pickup location was clear, we found it and got the car smoothly. However, the return location was not well explained as it was in the underground parking entrance of Euston Station. The store phone was unreachable, and there were no signs on the ground level. After searching for over an hour, we finally asked a local who directed us to the underground parking. The map and address provided by the rental company's customer service were inaccurate. It is recommended to have clear signage at the ground entrance or instructions indicating that the return location is in the underground parking.