I don't know what else it might be called. The active ingredient is 2% Chlorhexidine. You may have to call around to see if you can find it. Lots of farmer's use it here in the states. I'd say if it is available in the UK, you may be able to find it at a farm supply store. Here is a link to a generic version of it:
http://commerce.omahavaccine.com/sin...y.cfm?id=13366
I am not sure if they would be willing to ship overseas, or not. You could always check with them.
As for something else you could use...a surgical iodine or betedine solution would also work. You would mix it up a little weaker than the nolvason, though.
CAV,
Thanks for understanding that I wasn't trying to be difficult!
I would say that it is probably not a full-blown case of scale rot, but a bacterial infection is still something to consider.