Not sure about Euc.nortonii for this one, the leaves don't look quite like it to me (I'm under the assumption it's young foliage). Euc.nortonii also has is inflorescence in groups of 7, so I think this is more likely to be either Euc.rubida or euc.cinerea.
Highly likely to have been planted a long time ago. I can only seem to get a general and sometimes sketchy history of how the place was managed. Thank you. Appreciate the consideration.