Holborow Research Puzzle

As I’ve said a few times, I’ve taken the opportunity that this year has given me to go over old research and re-evaluate old assumptions that have perhaps niggled the back of my brain over the years but have been ignored due to being low risk. (And so speaks the Project Management Professional in me.)

All I’m saying to that is … oh boy. I might have made a bit of an error. I’ll set it out below and perhaps anyone could let me know their thoughts. I’d be grateful!