Hi Steve, these flowers don't look like staghorn to me, the staghorn has upright deep purple conical shape flowers. i think i see one in the top picture at the left hand side.

Looks like a Hebe, Steve.

I know the flowers are not staghorns, its just growing underneath & up the staghorn tree. lol

What Hebe is it Louise or is there only 1?

Loads of 'em, Steve !
I'm no help naming it i'm afraid but i 'do' know there are taller types, i've just bought a variegated tall one that has purple flowers.
Hebe salicifolia are the taller types, have a google and see if you can recognise it.

Just googling now and yes there's loads! lol

Found it. Called a Shrubby Veronica Hebe Great Orme
Well I think it is. lol

At least you've got something to go on now :-)

Oh yes Louise.

Definately a Hebe Steve