I didn’t send in my marriage certificate as the birth certificate has both my married surname and maiden surname on- so thought this would suffice
I’ll give them a call tomorrow and see what they say and will let you know
I go on holiday on the 14th of June- so hoping I get them back in time (I’ve sent 2 child’s first passports off, 1 to Hemel Hempstead and another to Peterborough)