In reply to SCrossley:
This is mentioned in the Classic Rock essay on Moss Ghyll Grooves
The crux moves of Moss Ghyll Grooves were considered irreversible before, in 1928, a party comprising L H Pollitt, H G Knight and G G Macphee made the first descent, with Macphee leading from the rear. The chief motivation was Macphee's desire to make the succinct entry 'MGG GGM' in the Brackenclose log book. (With a downward arrow between MGG and GGM)