Anyone know of any UK outlets that sell reasonably priced non-PVC or Vinyl-free mattress protectors?

I thought I'd got a bad case of nappy rash after finding some raised welts but it turns out that both my plastic pants and the mattress protector are PVC and after some Sherlock-style deduction it turns out that I'm allergic to it.

Got some PVC-free pants in the post but struggling to find any UK-based suppliers for mattress protectors that are Vinyl or PVC free.

This product is deal but US-based: