The new technique could help amateur naturalists and professional field workers in the front line of monitoring decades of decline in Britain's native bumblebees.
The Jubilee Line's planners failed to foresee the problems caused by the introduction of a novel tunnelling technique and a high-tech signalling system.
Dempsey's left-foot shot from 25 yards barely merited the label of speculative, but every aspect of Green's technique collapsed as he allowed the ball to squirm through his grasp and over the line.