Another slant on how to prevent blisters

With the Trailtrekker just around the corner (I now cannot believe I have committed to doing this again with in looming) and the training in full flight jaunting across the Yorkshire Dales and the Lake District bagging Wainwrights the prevalence of blisters is back with me so I've been again on the hunt for ways as to how to prevent blisters. I came across this video by Cotswold Outdoors;

I recall (how could I ever forget) how much pain the blisters threw at me, the chafing was manageable and the legs could have limped another 10 miles potentially but the blisters, oh the blisters were agonising. Everything to prevent the pesky blighters will be done...