I suggest you choose your rental car by using search engines such as autoeurope.co.uk, economycarrentals.com or others - they get better rates than you can going direct to the rental companies. Do watch for distance restrictions and fuel policy (full-to-full or "as taken", etc.) plus any insurance or driver restrictions, etc. There are two stand alone excess insurance companies worth looking at, insurance4carhire.co.uk and icarhireinsurance.com, and there are others - do not take out excess insurance from the hire company as it is far more expensive. One or two smaller hire chains have a poor reputation regarding customer service in certain locations so it is advisable to read some reviews, always remembering that complainants are more likely to write one. At the end make sure you get a piece of paper to say you have nothing further to pay and keep it safe for at least 3 months - obviously you will look the car over carefully when taking delivery of it, including spare/jack, etc. and condition of the interior (remembering the shelf on a hatchback plus any hubcaps).