The Judges'sentencing decision shows,
" 15. As a result, the total penalty which we consider it appropriate to impose for the contempt with which we are concerned in this case is one of committal to prison for 9 months, that is, 39 weeks.
16. The respondent has spent 10 weeks in custody as a result of the order for committal made by Judge Marson. It is appropriate to reflect that in the total penalty. As there is no automatic entitlement, in cases of contempt, to credit for time already spent in custody, we must reduce the penalty by a commensurate amount, which, on the information before us, is 138 days. If on subsequent inquiry, our calculation in relation to time already served proves to be wrong, the position can be corrected administratively
17. Mr Yaxley-Lennon, stand up please. You will be committed to prison for a period of 19 weeks.
18. The law is that you will serve up to half of this period. Once half of that period has been served you must be released."
I'm still none the wiser as to how two months in gaol gives a reduction of 138 days. Where does that figure come from?