For official info on mobility in the UK, check the '' DETR Mobility Unit '' site. Specifically see '' Self-Drive Car Hire for Disabled People ''. It is not complete yet and does not include URL's. To the author's knowledge, Germany is the best country to rent cars from in Western Europe. It's central location enables driving to any other Western-European country in 1 day or less.
Prices are usually reasonable and there is large selection of companies and cars.
Notice restrictions on taking rented cars to Eastern Europe. Europcar offered cars with hand-controls in it's site. Recently they removed hand controls from their list of special equipment on the English web page. There is a problem with overseas reservation offices of Europcar, refusing to serve drivers who need hand-controls even when cars are available. The only country where we have hand control cars available is in Germany.