The system is a joke.
The CMS needs more teeth, the penalties need to be much tougher.
Payments need to be deducted at source as standard, so they are reliable.
It needs to make much more effort with self-employed NRPs, as the disparity between what they earn, what they spend and what they pay in CM is disgraceful.
Those on JSA need to pay a lot more than £5 a week. £20 should be the minimum, and if that makes the NRPs life tough, then good, that's the price you pay when you're a parent - your child eats before you do.
If the NRP fails to pay, then arrears should be deducted the following month from source. If that leaves them short, see above.
If they still refuse to pay then passports should be withdrawn. If they can't afford CM, they can't afford holidays.
Next, driving licences withdrawn. And if people are worried about not being able to work without their car then they'll be more inclined to pay. There is also the threat of "you won't get any money if I lose my job", we'll I'm not getting any money anyway! While you jet off on holiday with your girlfriend and go on golfing weekends with your mates in your brand new Audi.
Then jail. Which I imagine would be a pretty effective deterrent.
Seriously, not providing for your own children should be a criminal offence. If the mother decided to contribute as much money and effort as the NRP father often does, she'd be charged with neglect. That's unfair. And sexist.
We need to make non-payment of child maintenance as socially unacceptable as drink driving.