But Mahonia aquifolium is listed as growing to over 2m tall, which yes
my Mahonia that I have always known as a Mahonia certainly does grow
to that height and is very erect.

But this plant only grows to 2ft tall max and has a spreading habit,
so would this be Mahonia aquifolium 'Compactum'


Mahonia. I looked at the JPG only to confirm - it is very
distinctive. There are several species, but that looks like
M. aquifolium (also called Berberis aquifolium), a.k.a. the
Oregon grape.


Regards,
Nick Maclaren.