Large scale OS of the scree etc.
OS refers to the 'Ordinance Survey' maps of the UK which every young Englishman grows up knowing how to read.
It says much of our education system that 'Geography' is the part of the curriculum devoted to learning the crops and resources of the nations of the Empire and learning how to read artillery maps.
Large Scale OS maps are the exclusive preserve of 'Walkers'.
For most of the world, 'Walking' is the standard method of human locomotion. The English, deprived of decent weather and beaten at all manly endeavours by our colonies, have tried to turn it into a sport. As you can imagine from the British, it is not regarded as competitive.
'Walkers' have dour expressions, rank layers of waterproofs, favour hideously plain girlfriends and thick brown ales and are pathologically unnattractive.
If it weren't for Welsh girls and University geology departments, no walker would ever be able to reproduce.
Scree is a bank of loose rock which often proves treacherous while climbing.
Scafel is a mountain somewhere ghastly in the North of England.
I found this out by asking a man with a beard.