Where a contracting authority is covered by Annexes 1 or 2 to the United Kingdom’s Appendix 1 to the GPA in respect of a procurement that is covered by Annexes 4 to 7 to that Appendix, the contracting authority shall accord to the works, supplies, services and economic operators of any GPA party treatment no less favourable than the treatment accorded to the works, supplies, services and economic operators of the United Kingdom.