There is this marriage
Austin Birtwhistle March qtr 1906 Glossop 7b 1120
to either Mary Emily Griffiths or Mary Elizabeth Mellor
Hi, i don't have a subscription to the 1911 census, but just on a search, the other male party in the marriage list is
a George William Casey, and in the 1911 search results there is a George William Casey living with a
Mary Elizabeth in the Ashton-under-Lyne registration district.
So it would appear that Austin Birtwhistle married Mary Emily Griffiths in 1906.
regards
Al