Wills

Borthwick Institute of the University of York.
A guide to finding Probate Records from the Prerogative Court of York.

ScotlandsPeople
Search for Wills & Testaments between 1513 and 1901 (Free).

National Archives
Searchable database of Prerogative Court of Canterbury wills (1384 - 1858). Also contains a useful guide on finding Wills in England.

National Library of Wales
Information on Wills proved in the Welsh ecclesiastical courts.

Probate Search Room
Information on Wills after 1 January 1858.