“In my opinion it is of great importance that the powers of the court and the rights of the contemnor should be as clear and as certain as is consistent with the need to design orders that do justice and reflect the infinite variety of fact and circumstance displayed by individual cases. Whilst arguably the power to create, sometime after the imposition of the original custodial sentence, a sentence partly immediate and partly suspended would be a useful refinement, in my opinion the gain would be outweighed by the introduction of complications which would certainly complicate a contemnor's judgement as to whether or not to apply to purge and which would arguably risk an increase of litigation in this already over-burdened field.”