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The lenticels on the bark are a really distinctive feature of Sambucus.
David J Trevan
Many thanks indeed for identifying this David, and also for your note - having had a scout around I can now see that this is exactly what it is. I've obviously got some more reading to do!
If you get a moment, could you possibly check the id of the tree at http://www.ispot.org.uk/node/320338? If this is another elder, I need to pop down at the weekend and have a much closer look at both trees because they didn't feel like the same tree. It's interesting how differently tree species can present themselves.
... even more obviously an elder. (You caught this one on the cusp of unleafing so neither then winter nor summer recognition patterns applied.)
Fascinating, thanks lavateraguy.
Lat/Lng: 57.16, -2.2
OS grid ref: NJ880076