There is a possible JH Richards living in Southport which would tie in with the possible marriage found on Lancashire BMD at High Park Methodist Chapel which is in Southport. Do you have the marriage certificate?
If that is him he is probably buried in Duke St Cemetery or cremated at Southport Crematorium. If this is the death there may be a death notice in the local paper, the Southport Visiter. Normally I would be able to have a look for you but it isn’t possible at the moment. He would only have a full obituary if he was well known locally. Do you have his death certificate to confirm he is the person you are looking for?