Pond liner, profiled rigid plastic (Purley CR8)

My wife would like to create some wildlife habitat on her newly allocated allotment with a small pond, with different levels [we already have a family of slow worms under a carpet used by the previous tenant for weed suppression, which we are hoping help keep the slugs down, and the rats in the compost bin of course...]. Anyone getting rid, or with one lying around unused, we'd be delighted to put it to good use. Thank you!