Hello, and welcome to Rootschat. I’m responding mainly to bump this up the list. I have had a quick look for the death but have not found anything conclusive.
I did note that in 1891 there are visitors in the Jewson household —Arthur and Elizabeth Aldgate — and in 1901 Alfred Jewson’s youngest son Edwin, 17, is recorded as nephew in the household of the same Arthur and Elizabeth Aldgate. This is consistent with Alfred having died before 1901, but it isn’t very strong evidence.