The Establishment
Royals - The official Royal web site. Information and pictures on all the monarchs of England, Scotland and the UK. The information is there but it is very much the orthodox view (no dirt).
Useful site for British Royalty - family trees, etc. all quite accessible.
British peerage and European Royals
Excellent site. We often find ourselves here when researching Lord Thingummy.
The history page is a good source of information on Prime Ministers in history.
Lists of holders of the Victoria Cross, their graves, photos, etc.