|Blow, blow, thou winter wind|
A couple of people offered suggestions in passing: 'You need to call someone.' How, exactly? 'Have you tried pressing the emergency stop button?' How would that help, even if I were prepared to abandoned a week's worth of food to go back the way I'd come? I looked around in vain for a trolley man or anyone else in Morrisons livery, but all the staff seemed to have disappeared.
Eventually, a burly man going up showed some sympathy and trotted back down to me. Grasping the front of my trolley with both hands, he towed me down to the ground as I thanked him profusely for his gallantry.
And then, in true superhero style, he was gone.