Late to the thread, but I used to live in the Kirklees area.
My dc's nanny from when they were tiny had had an arranged marriage at 16 to a first cousin she'd never previously met. Her elder sister was moving to the U.K. to marry his older brother, & at the last minute dnanny got, as she put it, 'thrown in as a BOGOF offer'.
It wasn't a happy marriage. When she tried to leave, she had nowhere to go & no family support - her parents were still in her home country & couldn't help - not that they wanted to, they made it clear that she was disgracing the family. Her dsis was sympathetic but couldn't help as she couldn't go against her own dh who was firmly Team Brother, & her ILs/aunt & uncle also put huge pressure on her to 'make a go of things'.
Last I heard, she was quietly racking up qualifications at evening school & getting her ducks in a row to leave when her dc were grown...
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Also, my youngest is deaf, so as a family we were involved with a local deaf kids' society. Every other family was from a cultural background where generations of cousin marriages were common. Many of the dc had other significant additional needs.
So yeah, I'd say it's a bit of a problem in WY, sadly. Not sure what could be done - the deaf kids' organisation was trying to raise awareness without pissing off the very parents who used them, which was a delicate business, to put it mildly.