June - I think that's worth a shot!!  I'd never thought of putting an ad in the local paper.  You never know, some distant relative might know something.  I know he lived with his daughter and husband towards the end of his life, and they were the Bartons, and I know there are Bartons still living in St Helens.  Thanks.
Marg and Gibel - I really will have to pay another visit to St Helens.  I've been a few times but couldn't find anything but then I was flailing around a lot, and didn't really know what I was looking for.
Gibel - Esther Jane, his wife, died following a fall in Stanhope St, St Helens 16.12.16.  Inquest held 20.1.17.  Information I've got from death certificate.  She is buried in St Helens Cemetery:
Grave Section:  46; Grave Number:  414; Not recorded; Purchased: Yes   
Lease Details:  Lease Type:  Fixed period    
Lease First:  21 / 01 / 1917   
Lease Start Date:  21 / 01 / 1917   
Lease End Date:  20 / 01 / 2017:  Lease PD, 100
In the grave with her are her daughter Edith Whitaker (nee Pendleton) (1969) and her husband John Thomas Whitaker (1941).