If you can make it to Ripon there was a good butchers in the market square the pork pies with egg were particularly good.
Note of caution it is about a year since I was last in Ripon and things can change!
In Wetherby I can't recall an independent butcher, but there is a very good Bakery on the Main Street near a pub called the Swan and Talbot. You can park in the
Morrisons car park behind the main street. (Don't park in the car park of the pub unless you are going in)
Update. I've just looked on Google and there is a Butcher's shop (never been in as it's always shut at the times I visit Wetherby) almost next door to the bakery which is called "The Oven Door" Google "North Street Wetherby " and use streetview for number 21 North Street.
Good luck and Good eating.