Good ideas - thanks all!
I'm not sure yet, but whilst a powder coated or galvanized bath could perhaps be made for £40, I'm sure a stainless steel one would be quite a bit more, though it would of course last a lifetime.
The problem with mild or galvanized steel is that formalin might well attack it. I'd be happy having one for myself (we only use zinc sulphate anyway, and could wash it after use and store dry), but I couldn't sell to others with a clear conscience in case there were problems further down the line.
Foobar - I remember you recommending the FB1
when I asked the same question last year. It may well be the best solution, especially if you can do two sheep at once. However, what puts me off is that it's a shade over £100 by the time it's delivered, and still needs nearly 100 litres of solution. That works out pretty expensive unless you can re-use it like you do. However, personally I struggle to use the Goldenhoof more than a couple of times before it becomes very muddy. Maybe I'm doing it wrong!?
BTW, following [member=9755]shep53[/member] 's suggestion, I did look at the foam mats. However, I wasn't sure that the solution could be made deep enough on the smallest mat to properly get between the cleats (OK, I know it doesn't need to be that deep, but I wasn't convinced enough to get one, since they weren't cheap either!)