I am no expert in employment law but it would seem sensible for each of those operations closing down to make their own people redundant [or to 'facilitate' them leaving of their own accord] before NPAS come on board simply to avoid the clash of employment law. This would seem to mainly effect directly employed pilots as the bobbies can simply be put back on the street and the contract pilots go back where they came from.
Problems may arise after next April but I guess that Hampshire and Merseyside staff will not be included...... and others [Cambridgeshire etc] may be 'sorted' by their current forces by then.
So.... in theory a small problem for NPAS?