They were made by Capricorn Engraving:
www.capricornengraving.co.uk(their web site is offline just now as they have just changed providers but it should be back up soon).
They used to be in the Goyt Mill but moved to Cheadle a while ago:
Dave & Christine Lowery
Unit 20, Demmings Road Industrial Estate,
Demmings Road, Cheadle, Cheshire, SK8 2PE
Tel: 0161 428 7444 (2 lines) Fax: 0161 428 3888
You'd have to get the council to fit them. I think Brian Nash at Regeneration would be a good contact for that:
Brian Nash
District and Neighbourhood Regeneration Manager
Regeneration, Economic Development and Tourism
Stopford House
Piccadilly
Stockport
SK1 3XE
T: 0161 474 4519
M: 07866 999929
Good luck!