Subsection (2) applies if—
In such a case the term of imprisonment or of detention to be served in default of payment of the amount does not begin to run until after the term mentioned in subsection (1)(b) above.
The reference in subsection (1)(b) to the term of custody the defendant is liable to serve in respect of the offence (or any of the offences) is a reference to the term of imprisonment, or detention under section 5 of the Treatment of Offenders Act (Northern Ireland) 1968 (c. 29 (N.I.)), which he is liable to serve in respect of the offence (or any of the offences).
For the purposes of subsection (3) consecutive terms and terms which are wholly or partly concurrent must be treated as a single term and the following must be ignored—
If the defendant serves a term of imprisonment or detention in default of paying any amount due under a confiscation order, his serving that term does not prevent the confiscation order from continuing to have effect so far as any other method of enforcement is concerned.