Are you going for a holiday?
I used to live in Bowness-on-Windermere, and I return from time to time.
There's never been a great deal in the way of craft places there unfortunately.
There used to be a good old fashioned sewing/wool shop in Windermere called Dorothy Rimmer's but that's been gone nearly ten years now I guess
There's a shop at 17 New Shambles in Kendal called Reticule which sells beads, findings, fabric, thread, ribbons and so on.
Kendal is just a short bus/train/car journey away
All the best,