It should be noted that under the terms of the Prostitution Act 1999,
Section 90 Prostitute working while infective with a disease
Paragraph 4,
(4) A prostitute must not, for the purpose of prostitution, use the fact that the prostitute has been medically examined or tested, or the results of the examination or test, to induce a client of the prostitute to believe that the prostitute is not infective with a sexually transmissible disease.
Maximum penaltyโ40 penalty units.
(5) For subsection (4), it does not matter whether the prostitute is or is
not infective with a sexually transmissible disease.
Basically, what this means is that although regularly tested, a lady must not use this as an inducement to a client. Something of a "grey area" perhaps, as I am sure that it would be reassuring to a client to know that the lady is healthy.