Shell's lawn mowing technique was rather haphazard.
You are supposed to mow a strip, then at the other end of the garden , turn 180 degrees and move to the side 9 tenths the width of the lawn mower
Mind you htis reminds me of the bit, so I am told of the Full Monty, where the men hire out the video of flash dance to examine how to dance and then proceed to criticise her welding technique
