In reply to Mark Bannan:
A cautionary tale:-
Last year when descending from Dun Da Ghaoithe on Mull, I was following a couple down the hill. When they crossed a stile they stopped, much to my surprise. However, when I got to the stile myself, they explained that they could not get their bike lock to one of their bikes unlocked. They had tried all the usual solutions, with no success. They must have been desperate as they asked me if I knew anyone who had an Angle Grinder on the island. The answer, unsurprisingly, was No. Thy had a real problem as they had to get back to Glasgow that night.
I carried on as I could not help. However, the story has a happy ending- they passed me while I was walking down the road to my car in Craignure.
Moral: If you are going to lock your bike, make sure the lock is in good working order.