Most of the garages in my area gave a free re-test if you brought the vehicle back with 14 days of the original test.
It seems, from anecdotal evidence, that since "computerisation" of the test these stations no longer offer such a re-test. I am aware that the rules never required a free re-test and that a full fee could have been charged.
However, if true, is there any reason for this change of position or is it an excuse to charge for both tests?