Just to add another point of view, and with full disclosure I am a resident of these flats, although not ground floor - but I overlook the garden in question. This hedgerow is teemimg with insect and birdlife and for the first time in years we wake to voracious birdsong. Please do not quickly jump to condem and cut back, there is an easily accessible and wide footpath on the other side of the road so would not be inconvinient to leave this wildlife oasis intact.