London Signatures offers a free index of more than 10,000 wills proved at the Archdeaconry Court of Middlesex from 1609 to 1810. Digital copies of the wills may be ordered online for 4GBP (view the sample images on the FAQs page to see what you'll be getting). Eventually the index will include "wills from the Consistory Court of London, the Commissary Court of Surrey and the Archdeaconry Court of Surrey," among other sources. The index may be searched by testator's name and date range. Unfortunately, the additional names sometimes included in the "Other Comments" field cannot be searched.