A few questions-
Do you have the marriage certificate of Jim to Dorothy?
Do you have a birth certificate for Jim?
Do you know specifically where Jim was born?
Do you know the names of any of Jim's siblings?
Regards
Ayashi
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Edit-
I couldn't see Jim on the 1939 Register, but I could see Dorothy (later WEST later CONNAH).
There is a marriage for Dorothy MADDRA to James L F WEST 2 qr 1851, Hull, Yorkshire (2a 541)
Further to this there is a possible birth:
James F L WEST 1922 Hull, Yorkshire, mother's maiden name WALTON (9d 510) (Note the switching of the middle initials).
Ayashi
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Further edit-
There are indeed a couple of PACITTO families living in Hull on the 1939 Register, so there may be some truth in their involvement in your ancestry. Having a look at them now but I don't think I'm allowed to post information on the 1939 Register here because of copyright rules.
Ayashi