4. Restrictions on magistrates' powers of imprisonment for failure to pay fines.

On convicting an offender of an offence a magistrates' court1 may not, in general, issue a warrant of commitment2 for default in paying a sum adjudged to be paid unless the offender appears to have sufficient means to pay the sum forthwith, he is unlikely to remain in the United Kingdom for long enough to enable payment of the sum to be enforced by other methods, or the magistrates' court is sentencing him to immediate imprisonment or detention for that or another offence or he is already serving a sentence of custody for life, or a term of imprisonment