The Quick-frozen Foodstuffs (Wales) Regulations 2007

2.  For the purposes of paragraph 1—

(a) an authorised cryogenic medium is—

(i) air,

(ii) nitrogen, or

(iii) carbon dioxide;

and

(b) a permitted exception relating to the temperature of a food applies when—

(i) that food is kept within brief periods during transport (including local distribution) at a temperature warmer than −18°C but not warmer than −15°C, or

(ii) that food is kept in a retail display cabinet at a temperature warmer than −18°C to an extent consistent with good storage practice but not warmer than −12°C.