OK. Spouse maintenance ends on remarriage so the nominal order has no longer effect. There is an order for child maintenance predating March 2003 and your husband can apply to court to vary that. As long as he pays what is in the order enforcement isn't an issue.
Contact is treated separately. Most people do appear to stick to court orders. If you think the mother won't distance does tend to complicate matters although there is a charity, Reunite, who might be able to help. Although Reunite specialises in international parental child abduction they offer advice and information on how to ensure your child maintains a positive relationship with both parents.See;
http://www.reunite.org