In Glasgow it is necessary to have 25 years to rent a car, but paying a supplement there are companies that rent to young people of 23 or 24 years. The permits that you can present can be national or international and the rates include the obligatory insurance of legal responsibility, to third parties and of public responsibility. In Glasgow you can visit the following offices.
Avis, 70 Lancefield Street, http://www.avis.co.uk
Budget, Glasgow Airport, http://www.budget.co.uk
Europcar, 38 Anderston Quay, http://www.europcar.co.uk
Hertz, 138 Hydepark Street, http://www.hertz.co.uk
National / Alamo, 76 Lancefield Quay, Strathclyde, http://www.nationalcar.com
Sixt Rent-a-car / Kenning, 192 Battlefield Road, http://www.e-sixt.co.uk
The city is really very compact, it is not necessary to have a car to get around, but if you decide to rent a car you can rest easy because the conditions for driving, parking and access are very good.