When looking for a specific law in Great Britain, you should know of the differences in e.g. Scottish and English law.
This is a more general view about the history of the European Inheritage and Succession Law:
source: Encyclopedia Britannica
You will find a more specific -but popularly written- answer from a dictionary of that time here:
The Victorian Dictionary: THE LAW OF WILL-MAKING
Sorry that I can't give you more information re Scottish Law (although I'm friendly with the Dean of the law department of a Scottish University

).