Traffic Signs Regulations 1981
Letters and numerals for use in route numbers on the sign shown in diagram 757 and on any sign shown in Schedule 1 Part V
The Traffic Signs Regulations and General Directions 1981; Working Drawings for Traffic Signs;  Drawing MW 1 of - [https://www.gov.uk/working-drawings-for-traffic-signs; This SVG prepared by the uploader.
UK Government (Dept of Transport) ; This SVG prepared by User:ShakespeareFan00