Hi,
Just seen the post, so sorry for the time gap.
The Clock Tower Jam Factory was quite definitely Hartley's as many have answered, and it had the Clock Tower [ a number of Photo's around]. In addition Jacobs Biscuits was also close to it in Long Lane, so definitely not at Huyton.
Humphrey Jones was originally a Commercial Traveller for a Biscuit Company, but may well have switched later to Hartleys Jam operation as he lived at Walton.
The daughter was Elizabeth Jane, and there are a number of Marriages for an Elizabeth Jane that would fit her age and Walton Address, but obviously if we now know she didn't marry, then there are no ancestors to tie in with her life in later years !
It looks like Humphrey's death in BMD's at Liverpool North SQ 1953 aged 79, which makes him born around 1874.
Cheers,
Long Tom.