Hi Mr Leary
I grow at heights of 450ft upto just over 1000ft
If growing on a S/SW facing hillside at the upper end of the scale, I tend to look for hillside sites with forestation just below them so the tops of the trees below are in front of, and just-above horizontal with, my site/s. This allows good wind protection yet still affords direct light for a massive amount of the day.
You might want to take a look at a larger-scale O.S. map for escarpments or real steep slopes if you don't know the area fairly well. These areas won't have been planted on if the hillside is forested yet the hillside below probably will have. Therein may lie your best site/s in such situations.
As for strains, you can take your pick from the many tried and tested here by UK420 members in the guerrilla growing forums and most will be available from the store. However, with the added elevation that you have I reckon you'll be wanting a good strain against mould and as early a finisher as possible because of the extra few degrees drop in temperature that you're going to get, compared to that experienced by outdoor growers at sea level.
It'll make all the difference once you get into October

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