Several years ago I made a Will after acting as Executor on my Mother's Will.
Having been through the Probate and Executor roles, I then decided to set up a "Will" folder with assistance/instructions for my Executor, listing everything to be taken into account (e.g. accounts held, Premium Bonds, Solicitor's details, Funeral plan details, recommendation for house clearance).
I am now considering adding DD and SO details, membership cancellations including online (for example Answerbank ID and password), etc. Very much a personal thing I would think, so good luck whatever you decide.
P.S. My instructions also recommended appointing a solicitor of their choice, and use the above to knock down the fees. I appointed family rather than my solicitor on his recommendation - it gives the Executor the choice to appoint a more convenient one (family are 100 miles away).