appropriate medical certificatemeans a certificate in writing given by a registered medical practitioner that a person requires food to which tryptophan has been added to treat a condition from which a registered medical practitioner has diagnosed him to be suffering;
food containing tryptophanmeans food intended for human consumption which does not comply with paragraph (1) of this regulation in that tryptophan has been added to it otherwise than in accordance with paragraph (4)(a) of this regulation;
hospitalincludes a clinic, nursing home, or similar institution;
pharmacistmeans a person lawfully conducting a retail pharmacy business within the meaning of section 69 of the Medicines Act 1968.
tryptophanmeans dextrorotatory tryptophan, laevorotatory tryptophan, or racemic tryptophan, or any salt or peptide prepared from any of those forms,