Hi yes John Holmes was definitely a hawker as it states this on Margaretta Ann's birth certificate that I've already got. As for the marriage of Miriam and John all I know from the records index is that it's Miriam Lloyd and John Holmes - marriage - Ruthin, June quarter, 1866, Vol 11b Page 621 but I have no idea where I need to go to look this up?
I'm not too sure where Llandegla is and Ruthin seems quite a way from Llangollen, but maybe that's just where the marriages were recorded as against being the place of marriage?