Do not allow non-resident parents with CMS arrears to move off enforced payments

Currently after 6 months of paying via an enforced method, such as a deduction from earnings order, the paying parent has the option to move to Collect and Pay, which means the paying parent is relied upon to make the payment. Should they miss payments it can take months to set up a new deduction from earnings order, meaning the resident parent can miss out on payments during that time. We want CMS to keep enforced payment in place where a non-resident parent has child maintenance arrears, until these are cleared.