Well, that was a revelation!
No question of any blisters (too short a walk anyway) as the new boots are really comfy. Each boot is ~720g, 230g lighter than my old assault boots, even though the new ones are lined. Amazingly, I can feel the weight difference.
Lower boot has fairly stiff construction, after the ankle, and up, the leather is really soft. Consequently, it felt like going for a walk in bedroom slippers.
Very early days, but I'm really liking the new boots.