Eh Up rosequartz, not just Yorkshire, a lot of the filming is done here in Lancashire, our moors blend into the Yorkshire Moors. The filming at Caroline's school takes place at Bolton School, an independent school based in Bolton. Not that there's any competition between Yorkshire and Lancashire tha knows.
My husband and his walking pals were initially refused bookings at a Yorkshire B&B, because they were a group of 6 men. During the subsequent phone call, it was explained to the proprietor this was a group of retired 60 somethings, who wanted to walk and may have a beer in the evening with their meal at the pub, but wouldn't be "trouble". OK - but noooo smirking said the owner.
It must be common pronunciation at it appeared in one of Victoria Wood's christmas shows, with people standing around under a sign that said "no smirking", all smirking away 