He also produced many other designs , including for bus shelters and the traffic light system in use across the UK .
Regarded as one of the best - known designers in Britain , Mellor specialised in metalwork and especially cutlery .
Mellor also produced many other designs , including for bus shelters and the traffic light system in use across the Britain .
Regarded as one of the best - known designers in Britain , Mellor specialised in metalwork and especially cutlery .