Another product from the cooperation between the London Metropolitan Archives and Ancestry. There are 369,559 records.
According to Ancestry's information "These are original wills only and do not include wills or administrations found in will registers or act books which are accessible on site at the London Metropolitan Archives. These do not include wills proved in the Prerogative Court of Canterbury."
Unfortunately it doesn't mention which courts are included!
UPDATE: According to Else Churchill from the Society of Genealogists the set includes wills from the "Commissary and Archdeaconry of London along with those from the Consistory of London and Archdeaconry of Middlesex." http://goo.gl/4bEkQ