<Why would the skipper want his a/c de-icing when the temp is +8 and dry, the a/c has been on the ground more than 1 hour, just been refuelled and there is no airframe icing?>
I would assume he had tankered fuel in. Even at +8, there may have been ice underneath the wings- it can last longer than an hour. Topping up with warm fuel will not always clear it. He might have tankered a large quantity in of very cold fuel. It is possible to stay there for far longer than an hour. Instead of assuming nonsense like dicksenormous or questioning his sanity, it might be fair to just accept that the Captain may have had some justification to have asked for it!