Since Herts and Beds are reported to have signed up to NPAS on the understanding that support would be supplied by the Met and given that the Met have decided not to be part of NPAS, it would appear that Herts and Beds are at liberty to reinstate their old police helicopter service due to contract conditions not being met.
It will never happen though because the wording of such agreements is full of woolley terms and conditions that will obligate Herts and Beds to pay a contribution to NPAS whether or not they run an independent service of their own. So it can never represent good value for money.
Whenever politicians get involved you always end up with half the service for double the money.