Where in the UK can I find a bath panel like this?

All the ones I can find on the DIY or plumber's supplies type websites are flat, but I need to replace a curved one fairly similar to the one in the picture. It's not possible for me to travel to these places and browse, is there a search term that would help me find the right kind of shaped panel? Or maybe someone knows of a UK shop that has them, if you could tell me the style/design name or number it would really help..🙂

Incidentally, when you search for curved bath panels you just get panels for fancy-shaped baths, and not anything like the one in the picture!😅