The marriage entry on Ancestry I identified
was for Herbert actually - BUT I agree with you Josey -- there is a marriage for a George Maskill to Mary Smith in Pontefract Reg Dist
in 1937 BUT this is after Herbert's marriage -- hence I am not sure if this is the correct marriage.
If it IS the correct George Maskill and Mary Smith wanted by Tanya - this late one in 1937 must be a second marriage.
I would have thought - if researching the blood line - Tanya could do with Herbert's actual mother from his birth cert.
Just seen that Herbert is Mary's son! However he has given his father as George Maskill on his marriage!
Tanya -- you can find Herbert's birth on FreeBMD -- you can obtain the details ie District, Q/E, Vol number and Page number and order on line from General Register Office.
Alternatively search the GRO birth registrations and order a PDF copy for £7
https://www.gro.gov.uk/gro/content/certificates/login.aspYou will need to register the first time you use the site.