“Those authorities demonstrate the importance and impact of dishonesty. It is not simply that public confidence in doctors is likely to be diminished if doctors are dishonest. It also has a practical importance in the regime of licence to practise. If dishonesty is practised at the stage of revalidation and obtaining a licence to practise or alternatively a doctor fails to get the necessary licence to practise, then he or she is not being properly subject to the regime, the purpose of which is the protection of the public and the maintenance of proper standards.”