I gave you wrong info. A quick search has come up with this:
Wills (from 1858): The Probate Department, First Avenue House, 42-49 High Holborn, London, WC1V 6NP. Telephone: (020) 7947 6000.
http://www.courtservice.gov.uk/cms/3800.htm
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(before 1858): The Public Record Office (PRO) holds copies of some wills from before 1858, but by no means all. The records held by the PRO can be seen at Kew as well as at the Family Records Centre - see below. Other records are held by County Record Offices.
Public Record Office, Ruskin Avenue, Kew, Richmond, Surrey, TW9 4DU. Telephone: (020) 8876 3444.
www.pro.gov.uk