i personally would represent myself in this situation you can ask the court for a Mackenzie friend to help you in court they cant speak on your behalf but can advise you, take notes also try citizen advice they can help you
i support my 2 children no problem at all so I will most definitely use all the spare time and energy to fight this as it is wrong on every level that a man thinks it’s ok to lie about earnings fiddle his books to pay the least amount possible