BRICK MATCHING COMPANY (thats its name) Shrivenham Rd SWINDON UK, try GOOGLE TO FIND. May be branches elsewhere.
If you can file grout colourant powder (tile suppliers) NOT COLOURED GROUT, it is/was??? used to colour white grout .It can be used (black+red mixed with mortar to give most shades of plummy brown), or cement colourant similar.....all in all a bit hit and miss. Make it up darken than required colour as it dries lighter. Use neat UNIBOND PVA to act a key to ensure mortar attaches securely to broken brick.
KIBBY, January 2006