Where was that then, hurworth ? That's quite interesting. The local bigwigs would expect to stump up the money for the clock, or similar items, so they do even though they are actually Catholics. I suspect those who weren't Catholics just regarded them as being a bit odd, with strange religious views but basically okay. By the eighteenth century things had settled down more or less, so whatever they choose to do in private isn't generally seen as a problem.
By the way, although they marry in the local parish church for legal reasons, that is they need their children to be regarded as legitimate and their heirs able to succeed to property etc, they would also have had a private Catholic ceremony. They wouldn't regard the C of E service as valid in relious terms. I don't think most people realise that.