4.—(1) In these Regulations, an “economic operator” means a contractor, a supplier or a services provider.
(2) When these Regulations apply, a contracting authority shall not treat a person who is not a national of a relevant State and established in a relevant State more favourably than one who is.
(3) A contracting authority shall–
(a)treat economic operators equally and without discrimination; and
(b)act in a transparent and proportionate manner.
(4) In these Regulations a relevant State is a member State or a State listed in column 1 of Schedule 4; the agreements with the European Union by which the provisions in relation to public procurement are extended to those States are specified in column 2 of that Schedule and the statutory provision designating them as European Treaties under section 1(3) of the European Communities Act 1972(1) are specified in column 3 to that Schedule.