As a heads up, I found these panels on Amazon recently and have found they work well in the bottom of a plasterers bath.
I use three of these panels in the bath to keep the carcass out of any blood...they clip together...and usefully, when unclipped, they will fit in the dishwasher.
shed base 1 Eco paver for shed base or pathways each Paver size 333mm x 333mm x 40mm: Amazon.co.uk: Garden Outdoors
The plasterer's bath I use them in is this one from Toolstation. It's great...extremely tough.
Plasterers Polyethylene Mixing Bath 165L - Toolstation
Polyethylene is the material which will stand up to flexing and cold weather without shattering...my Homebase plasterer's bath lasted only until I actually put a carcass into it...then the lip broke off and it split almost to the base...absolutely useless.
Alan