"13. We have no doubt that the judge was right in this case to say that an immediate custodial sentence was necessary for these offences, and secondly, we are quite sure that he was right to conclude that there needed to be an element of deterrence in such sentences. There has been for some years now a good deal of publicity about the process of insider trading. It has been well-known for many years that it is conduct which is a serious criminal offence. We have little doubt that if the defendants had been professional City traders they could have expected a sentence significantly greater than the sentences which were imposed here. We have been referred to the fact that new legislation enables some insider trading to be dealt with by means of regulatory or disciplinary process. That does not mean that the activity ceases to be a criminal offence which is likely to be prosecuted and if prosecuted likely in appropriate cases to be met by substantial sentences of imprisonment. Overall insider trading is a serious matter. On a large scale it corrupts the whole of the market in capital."