Sorry your having problems Keith. If you can get it up to Northerlite he will sort it for you and Casso on here gives sound advice too.
Still a young dog so shouldn't be a problem to get sorted, as it would be a real shame to retire her after all your hard work upto now.
Keep us posted on how things go.
Atb
I'm catching them from an inlet of the Thames so not the cleanest water in the world ... purging cleans them out of any crap and takes away the shitty river taste ......Got you now Cheers