Mistake as to qualification is irrelevant, so long as consent was given to the nature of the medical procedure. Contrast with the case of R v Tabassum.
Richardson was a dentist who had her license suspended, but continued to practice. She was sued for battery.
The court found that the victim was mistaken only to Richardson's qualification not her identity or the nature of the medical procedure or the medical procedure itself. Therefore consent was valid and no battery had been carried out.