] Do we find more inter-marriage between tradespeople and the traditional gentility in the north because they don't have as many options or this a pattern for what was happening in England at the time?

I think this exemplified social relations which would later spread through England. According to the Introduction, roads had improved and canels connected towns. So it appears despite the north's remoteness ;there was increased mobility for people travelling to and from northern areas; Society must've become more variable, 'less tedious' for the local gentry.
Apparently by the late Eighteenth-Century,the landed gentry had to supplement their incomes. In the north,textile manufacture had been long established; If the gentry invested in commercial activities, they would not only increase their business but social contacts with tradespeople-from business offices and banks to the assembly rooms then the dining room and even the alter.Perhaps a son of impoverished,old gentry and a wealthy merchant's daughter.