By Sam Elliott-Gibbs & Paul Vass A terrified pensioner lays unconscious in an image that brings more shame on Britain’s pothole-riddled streets. Ann Nightingale tripped over as she briefly stopped on a pavement to say goodnight to a friend as the heel of the 77-year-old’s shoe caught on the crater behind her. That causing her to fall backwards and crack her head on the edge of the 5ft long pothole, knocking her out. Shocked friend Kevin Dunn, a former HR manager on the QEII passenger liner, feared her injuries were fatal but thankfully Mrs Nightingale came round in the ambulance and was treate…