ExH earns £1500/week. CMS have recently reassessed his earnings and have almost doubled the monthly maintenance amount he's to pay. As he has omitted to tell the CMS about his increased earnings, they have backdated the assessment so he has arrears to pay as well as the new monthly amount.
He's absolutely livid and has appealed their decision, as well as not paying the increased amount at the start of this month.
Can anyone tell me what the appeal process is like and how long it normally takes? Also, on what grounds is he likely to succeed with his appeal?