In reply to BnB:
> Likewise. Do you have any evidence for this statement? Are DMM extoling extra water-shedding properties? What other special features would be appropriate to the UK?
http://dmmclimbing.com/products/ropes-&-cord/
"Our ‘Core’ ropes balance technical specifications and construction techniques with value for money." "Our ‘Pro’ ropes have been designed to handle more abuse again, be it from the climbers themselves or from environmental factors. The additional dry treatment makes it not only repel water and dust more readily, but it also makes the dynamics of the rope work better giving better stats throughout."
In other words, DMM balanced a set of properties according to their priorities. It doesn't say anything about the UK, but for the Spectrum rope they say "These ropes were designed to cover the whole spectrum of British climbing – from Gritstone edges to mountain classics." For the Migrant rope "Spring in North Wales, summer in the Alps, autumn in the Picos or winter in Scotland"