Have you spoke to Gnarly? They can be very accommodating at times with parts off bikes etc and they also support a local guy who buys and sells bikes and parts like they are going out of fashion. Check out Ross Readmans facebook page to see what he has about: Ross’s Rides (it might be invite only but can add you easily enough, be prepared to fill your timeline with it though as he is full on but a really nice guy whos heart is in the right place and has recently bought Steve Peats Bronson which I don’t think hes shut up about yet)
Sadly though most of the shops wont be stocking much of the really nice kit as its too expensive to keep in stock. they will all order next day.
I know its a bit out of the way but have you considered Two Wheels Only in Stourbridge….without doubt one of the best shops in the wider midlands area. They tend to stock a bit more.