Propertyfinder.co.uk
On of the largest property databases in the UK with thousands of homes for rent or sale.

web2let
Extensive list of properties for rent primarily in the greater London Area.

Fish4homes
Extensive list of properties for rent plus an excellent list of sales also. Includes directory of estate agents plus information on moving, insurance and legal plus more.

Loot Property
Over 10,000 properties to rent nationwide.

The London Property News
Online version of the popular London Property News magazine. One of the largest sources of information on London property for rent or sale on the internet.

wheretolive
Good listing of properties to rent or buy throughout the UK.