I have a hole in my external wall for an SVP its about 0.5m from
ground level. I also need to ventilate 2 bathrooms and a passageway
(its a cafe conversion)... is it possible to terminate the ducting for
the ventilation at this low height or as per the SVP must I run a pipe
up above the gutter and terminate there?

The walls are pretty substantial (70 cm thick stone) and I'm not
inclined to make another hole.