By Alahna Kindred The most expensive airport car parks in the UK have been revealed with data showing the pricest place to leave you car during the holidays. Heathrow Airport was found to be the most expensive in the UK to park a car for a week – setting Brits back £123 per vehicle. Meanwhile, the cheapest airport for parking Edingburgh, only charging charging holidaymakers just £34.99 for the seven days – a £90 difference. The data was publsihed after travel experts at FlightsFinder.com have analysed the fifteen busiest airports in the UK to find out who charges their customers high prices an…