Hi, I often use electrical marking cable tape, like insulating tape but about 5mm wide, comes in various bright colours, there is a cheaper cloth, white tape, often printed with numbers. The bright colours are good for MLP print users, the white tape curves round corners better. http://rswww.com/cgi-bin/bv/rswww/subRangeAction.do?cacheID=ukie http://rswww.com/cgi-bin/bv/rswww/subRangeAction.do?cacheID=ukie These links didn't seem to work, so I've put in a picture, not the best idea I know. I buy it from RS electrical wholesalers (Watford). Keren