Allan - I've 'tweaked' your last post in order that Mr B doesn't feel persecuted for things I've said
Yes, the definition of what tundra is (or isn't) in this context appears to be killing things a smidgen.
Arguably, large tracts of upland Scotland or indeed the isles could readily be classed as semi-Alpine tundra which is what I've always known it as.
That description Irvine has posted courtesy of the Cairngorm National Park website works for me
Supplementary clue needed
I'd always known Orkney & Shetland as the 'Orkneys or Shetlands' when
not including islands in the name, so will make every effort to get that right from now on
H