Might also be an idea to check what she wants you to be tested for (unless she's already told you) to ensure that you get tested for everything on her list. You wouldn't want to miss out on a technicality.
According to Cardiff and Vale Health Board's web site they routinely test for chlamydia, gonorrhoea, syphilis and HIV at the CRI clinic, but only chlamydia and gonorrhoea at the community clinics.