We're at 1000 feet (the limit for apples apparently) just a bit south of you, so windy, wet and cold. Oddly the apple I have found to be consistently good is Blenheim Orange. It's mainly an eater but can be used as a cooker when fresh. It's totally delicious, sweet, sharp and perfumed - makes me drool to think of it
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The other apple I have which is good is a cooker which I got from John Butterworths at Garden Cottage, Auchinleck Estate Cumnock, AyrshireKA18 2LR
25 years ago. It's a light green slightly wonky shape but prolific and reliable, although not a keeper. It could be Hawthornden, which is the same as Lord Ribston I think. His stock seems to be available at [url]https://www.scottishfruittrees.com/ I'm not sure what's what there - it's a long time since we met John B and his wife and they were soo helpful.
I am ever the optimist so I recently planted several young apples to replace all the ones which didn't make it here, but the fruit is so far staying small and hard - I suppose they need a bigger root system to get going properly.
You will know not to even try Cox's Orange Pippin, delicious though it is when grown in the right place.