To beat the Child Support Agency (CSA) you can have a private arrangement as the parents of the child and agree on an amount of money you shall pay for maintenance. An alternative way is to complete a variations form so that the CSA can take into consideration the expenses incurred while accessing your child. You can also consider becoming self employed as your daily expenses will be treated as deductible, thus reducing your declared earnings.
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It is very difficult for the CSA to do anything to a father who is self-employed. By the sounds of it they have tried everything except the final few measures, as no doubt taking his driving licience
It is very hard to beat the CSA (Child Support Agency). You can escape them only if you do not have an income. For further assistance, you could join a fathers' association for non-residents at: http://www.deadbeatdadsassociation.co.uk/