Not sure, I think the record is 32lb from Awe, wouldn't be at all surpised if that record gets broken, there must be bigger trout out there somewhere. I know there are doubles in the Don, I know of one caught several years back by a salmon angler ealry season on the middle river, not sure how big they would / could get on the Don, we still know very little about Don trout.
Cheers
Ben