The Disease Control (Interim Measures) (Wales) (No. 2) Order 2002

2.  The isolation facility must be designed so as to ensure physical separation at all times between the animals being kept therein and any other animals on the premises or any other adjoining premises and in particular must consist of—

(a) a separate building used solely for the purposes of isolating animals from any other animals also kept on the premises;

(b) part of a building used solely for such purposes and divided from floor to ceiling from any other part of the building by a solid partition or an adequate temporary structure (which, subject to paragraph 3, may be comprised of bales of straw) designed in each case to ensure that—

(i) there is no appreciable flow of air between the breeding isolation facility and any other part of the building; and

(ii) there is no possibility of seepage of any effluent, manure or other discharge through or under the partition or other temporary structure; or

(c) a separate pasture surrounded by a secure stockproof fence (which may include electrified fencing) or other barrier at least 50 metres in distance from any other pasture or building where animals are grazed or kept with further secure stockproof fences or other barriers being erected elsewhere on the premises where this is necessary to prevent those other animals coming within 50 metres of the isolation facility.