2. Where any migration test specified in this Schedule and, where appropriate, Schedule 3 is carried out on any sample taken from any plastic material or article and the quantities of food or simulant placed in contact with the sample differ from those employed in the actual conditions under which the plastic material or article is used or is to be used, the results obtained should be corrected by applying the formula M = (( m.a2/a1.q).1000) where —
(a)M is the migration in mg/kg:
(b)m is the mass in the mg of substance released by the sample as determined by the migration test;
(c)a1 is the surface area in square decimetres of the sample in contact with the food or simulant during the migration test;
(d)a2 is the surface area in square decimetres of the plastic material or article in actual conditions of use; and
(e)q is the quantity in grams of food in contact with the plastic material or article in actual conditions of use.