A different perspective - emotions are running high and there is often no trust, but I think it's important not to overreact. Contact is the right of the child, not parents, and good contact for children relies on parents learning to work together. Stopping contact effectively forcing the issue through the courts tends to prevent that from ever happening and a better way forward its to negotiate an agreement about how contact is to develop. Would it really be so bad for the Father to have the child alone for an hour say on a Saturday to walk to the park or take home? The only way any of us gain parenting skills is by actually caring for our offspring.
Both parents have equal Parental Responsibilities and most parents come to arrangements themselves. When that isn't possible the orders (contact, residence, specific issue, prohibited steps) in s8 Children Act 1989 can regulate PR.
To clarify, s13 of the Act says that when a residence order is in force neither parent shall remove the child from the the UK but this doesn't prevent the removal of a child, for a period of less than one month, by the person in whose favour the residence order is made. When there is no residence order in force either parent may take a child abroad for up to one month.
However, the overriding factor is the best interests of the child and in an emergency it's possible to apply the same day for an interim residence order to prevent a child's sense of security and established bonds from being disrupted and a prohibited steps order to prevent a child being removed from the UK.
When there is no a residence order in place the police don't really have the authority to do anything unless they are convinced there is evidence of potential international child abduction in which case they issue a warning to all UK ports.