Everyone (except Mark Burley and Sophie Kirk by the looks of it) missed it because no.1 was in wrong place if you look at GPS satellite image
Still, no excuse. ;)
(Did Clive miss it walking on a bearing?)
yes....., but forgot by the end because of his 5 minute mistake at 9
actually my GPS trace suggests #2 might (also) have been in wrong place - I recall being slightly surprised by the angle required to reach #3
the trace also has some things to say about #9 and #12 (which seemed low to me, but then I clearly have difficulty interpreting ascent and descent on the ground)