This might say it better.
Driving disqualification
Make sure you take full details of your financial situation to the hearing and proof about why you need a driving licence. For example, you could take a letter from your employer to confirm you need to drive for work and that you might lose your job and be unable to repay the arrears if your driving licence is taken away.
The court will consider all the circumstances of the case. If they decide that you've deliberately refused or neglected to pay maintenance, they can stop you from holding or obtaining a driving licence for a fixed period of up to two years.
The court can decide to suspend the order. They could do this for example, on condition that you pay a set amount towards the arrears until they're paid off. If you don’t keep to this arrangement, the penalty will be re-instated.
Prison
If the court doesn’t think that disqualification from driving is appropriate, they could:
issue a warrant to send you to prison, andsend you to prison for up to six weeks.
The order to send you to prison can be suspended, and conditions set out about when it will start. For example, you can be given time to pay off the arrears before you're sent to prison.
After your prison sentence ends, your arrears are not written off. You remain liable for the arrears and the CSA or CMS can continue to take enforcement action against you.