The 1911 has 6 entries for John Cronshaw living in Burnley of which only 3 were old enough to marry in 1912
4 Margaret Holgate's - one only just old enough - the other 3 all adults
That info pre-supposes they were actually living in Burnley in 1911. Some of the entries were already married
Unless you have more info not posted here - you will need a copy of the 1912 marriage cert