I think you have the wrong info re Hereford .....
found this
Familysearch.org / search / Record Pilot
Robert McCall born 15th december 1883 in Peel .Isle of Man
parents William McCall and Margaret Burdin McCall
so he was born Peel ,and not Herefordshire.....do you know where the BURDIN middle name comes in to Margarets name ??....she is not Margaret Burdin Marr on her marriage record
allan

same site Peel ,Isle of Man William John McCall born and died March 1881...father William McCall
Margaret McCall born 1852 died 30th december 1879 .......father William McCall ......
hmmm ...do we have 2 families in Peel with parents William and Margaret McCall ...that`s how it looks to me...maybe that`s why the mother is named as Margaret Burdin McCall .......anyone any thoughts please ??
allan