Ancestry has recently released the England & Wales National Probate Calendar (Index of Wills and Administrations) for the period 1861 to 1941.
This has already proved (pardon the pun!) its worth – a search for the surname HAGESTADT reveals a lot of information!
The Calendars often give siblings and/or spouses as executors, and can also give dates and places of death as well as occupations of both parties, all to help populate your tree details.
Give it a look!