malky_c wrote:Different skis, different boots and bindings and different techniques to downhill skiing, so I'd say downhill skiing won't help much.
This would be true if classic cross-country track skis were suitable for the Scottish hills, but they really aren't! At the very least you need Nordic skis with metal edges and some sidecut to making turning on the downhills actually feasible without superb technique. It's possible to have quite a lot of fun on this type of ski in Scotland, though unless you acquire at least some basic skiing skills, anything but the gentlest downhill will be slow, tiring, frustrating and scary! If you are fit it is possible to cover quite long distances, but the route opportunities that avoid steep slopes and have reliable snow cover in Scotland are rather few.
The majority of tourers in Scotland these days use Alpine touring gear rather than Nordic: these are basically lighter weight downhill skis with a binding that can be released at the heel for going up and locked in for going down. This makes the downhills a fair bit easier, though you cannot travel as fast on the level.
Whichever option you go for, time spent acquiring skills on the piste will be well spent. However, skiing off piste is often much more challenging as you can encounter any manner of tricky snow conditions, and defensive tactics such as stem turns, sideslipping or even kick turns can be very useful!
You shouldn't expect magically to be able to travel a lot faster in the hills on skis: in typical Scottish conditions of windpacked or icy snow, the speed gained on the downhills is offset by being slower uphill and faffing around with bindings and skins.
(For what it's worth, I started out on Nordic kit, went through several iterations of buying beefier and beefier kit as my ambitions outstripped my abilities, and eventually converted to Alpine. I'm no star skier: no better than intermediate - i.e. happy on red pisted runs - but I still really enjoy the touring here.)
NickyRannoch wrote: Is it a distinct discipline that means i should go an a specific ski touring course or do I need a bit of experience on the downhil slopes at Glen Shee first?
The real answer is both: see for example the expected pre-requistes here:
http://www.glenmorelodge.org.uk/course-skiing-skills-display.asp?course_id=76 Kit is unfortunately pretty expensive: at least a grand for a reasonable Alpine touring set if bought new.
To begin with, second hand would be good option. There are a few ski touring clubs which may have kit for hire if you are a member:
http://www.mcofs.org.uk/ski-touring.aspHope that helps!