I hope they add something to what has previously been posted, but apologies in advance if I’ve missed a post which makes this one redundant!
Death date from https://www.myheritage.com/names/janet_forbes-walker
She was d of Rear-Adm Hon Arthur Lionel Ochoncar FORBES-SEMPILL 1877-1962 (s of 17th Lord SEMPILL 1836-1905) and his 2nd w Helen Mabel d 1921 d of Maj John ALLEN of Brackley House, Brackley, Northants. She m 1958 Norman FORBES-WALKER d 1994 s of Harry WALKER of Moseley, Warwicks, and had a son.