I bought a white plasterers bath a while ago from Travis Perkins (rather than the more common black):
From what I understand white ones are particularly hard to get hold of and even Travis Perkins don't stock them on a national basis. I've just come across one in ToolStation catalogue and it's available next day to most parts of the country for £29 in P&P (may take a few days to Highlands etc).
Not seen one in the flesh, but appears to be exactly the same as the one I've got and I can highly recommend - takes 3+ roe no probs and easy to clean as you can see the blood. Hope it's of use to someone: