For animals born 1 Jan 2010 or later and going for slaughter before 12 months
One non EID slaughter tag, containing only the flock number (cant use any old ones which might have had indiv nos on them). Any colour other than red (reserved for replacements), black (reserved for sheep with bolus ID). Ideally also not yellow as recommended to use that for EID tags only as its reserved for that in rest of UK).
If you later upgrade to keeping beyond 12 months this has to be cut out and full EID tags put in (red if not on holding of birth, colours as below if off holding of birth)
For animals born 1 Jan 2010 or later and kept over 12 months, one identifier must be electronic and the other a conventional ; both identifiers must have the same individual number - a zero then your unique flockmark followed by a five-digit indiv animal number. It's recommended but not compulsory (in Scotland) to use yellow for the EID tag, the other non EID tag can be any colour except red (reserved for replacements off holding of birth) or black(reserved for bolus tags)
Replacement identifiers applied off the holding of birth must be red (including replacement EID identifiers);