Getting the will is the easy part, no? Wills are public record in the UK at least.

A cautionary tale: Someone in my family died before getting his will sorted out, leaving a tangled mess of accounts and businesses. My mother was one of his executors, and they had to in effect remove themselves from the will because it was written before his children were born and they weren't mentioned (the lesson being if you have children or any one else you care about, get your will sorted out sooner rather than later - in this particularly case he was found dead in the morning without warning)