The message
from Lobster contains these words:

OK, so what's the best time of year to attack it, then? There are two
criteria which may or may not be contradictory: first, maintaining the
health of the hedge, and second, minimising the time during which it
will look totally crap and the neighbours will be able to peer through
and watch our every move ;-)

Late winter - early spring, say, end of feb to beginning of March. (I'd
say...)

--
Rusty
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