The Sadlers Sav was still cloudy, though improving.  I wonder if part of the problem was the filter not working properly?

So I went to the excellent May and Brett and described my problems.  The guy at the shop immediately rang Sadlers, they talked through the problem and the next day some new chitosan arrived in the post.  I stirred it in to the demijohns, and they went cloudy, as predicted.  We’ll see how it turns out.  I pushed the bungs in, but the next day when in the cellar for something completely unrelated I noticed that one of the bungs had popped off!  I pushed it back and checked the next day, but it had popped off again.  I suspect I had filled it a little full so the air pressure was against me.  Since that demijohn was a blend of the Californian and the Sadlers, who knows whether it has made a massive difference.  I popped in a campden tablet just in case.