The only reason I can think of for diverting to ABZ in this case is that the crew really thought they had a gear problem. However, Wick is more than long enough and has the required fire cover to cope with such a situation so why was ABZ necessary? Eng cover maybe?
I've also heard that there is a fault/feature/set of circumstances on the Jetstream that can result in three greens without the gear being down, is this correct?
Either way, I'm still struggling to comprehend how the crew could not have felt the prop strike on the runway. And if they had, why cross the water to ABZ with a damaged prop, and with it still running!