Posted: 12/10/2015 at 15:10
Oooh, lovely part of the world - we spend most holidays in Cornwall and have done for years - we were your way last summer - on the southern edge of Bodmin Moor and about 10 days ago we were at St Agnes. A regular and stalwart member of this forum is in West Cornwall and keeps us pretty well informed of the 'near tropical' climate he enjoys and we visited gardening friends just southwest of Dartmoor en route to St Agnes and looked around their garden, so I'm pretty sure your tree's not been damaged by chilly winds, even if you're pretty high above sea level.
I think that prior to you buying your trees they'd been kept in a protected environment, perhaps a little shady, and then when you put them by your front door one of them in particular got so much sun that the tender leaves scorched.
For some reason the other tree wasn't affected - either the growth on the second tree wasn't as tender, or it doesn't get as much sun as the other tree.
What to do about it? I would leave it for now - the scorched leaves will dry and fall off - it'll look horrid for a while but the tree itself hasn't been damaged and next spring it'll grow new shoots and leaves. The tree will have been acclimatized to it's new home and the leaves will be tougher and shouldn't scorch in future.
Hope that's helpful