The best place to start when looking for your flights, car hire etc, has got to be

Travelsupermarket.com

Another good one for flights is:

Skyscanner.net

Or you can link to individual airlines on the 'getting here' page

Other useful links:

airport-car-parking-uk.org.uk

holidayextras.co.uk 

valuecarrentals.co.uk

carrentals.co.uk

insurefortravel.co.uk 

mojacar.co.uk