Reading his personal history he seems to have done most things, or at least a great deal more than most, so he may well have rowed up rivers in his time....
I hadn't noticed the programme before you mentioned it, but I will have a looksee and give him every chance, but in the past his TV manner has met with derision from many folk....
He seems to be involved in taking parties to all parts of Europe at the moment, so he keeps himself busy and earning a crust.
A pretty impressive fisherman in my book..
ps Historian? Not too sure about that!