In message . com,
"Cat(h)" writes
I won't promise anything; I neither know exactly how exposed your site
is, not exactly how tolerant the trees are; but Silver Birch (Betula
pendula) or Rowan (Sorbus aucuparia) might do. (I suspect that the Irish
Whitebeam (Sorbus hibernica), which grows in the Burren, wouldn't like
your acid soil). Birches and Rowans are short-lived.

I didn't know that - what does short lived mean? 20 years? 50? I
have a personal preference for the rowan, there are some magnificent
multistemmed ones in the area.

The web page

http://www.gardenplansireland.com/forum/about702.html

says 100 years for rowan. (50 years is short-lived for a tree.)
--
Stewart Robert Hinsley