Sch 4 para 33
(1) The fixing of the seal of an NHS trust must be authenticated by the signature— (a) of the chairman or of some other person authorised (whether generally or specifically) by the NHS trust for that purpose, and (b) of one other director. (2) A document purporting to be duly executed under the seal of an NHS trust must be received in evidence and must, unless the contrary is proved, be taken to be so executed. (3) A document purporting to be signed on behalf of an NHS trust must be received in evidence and must, unless the contrary is proved, be taken to be so signed.