I emphasise that I will be complying with my NATS contracted hours and meeting all unit minimum validation requirements. I'll just be doing absolutely nothing extra such as AAVAs, attending things on rostered days off, continuing to hold validations over the MUR, and running a sector with less controllers than that agreed in the Working Practices.
I would suggest that anybody thinking of similar action takes expert advice from the union or elsewhere before doing so. Mrs Thatcher's legislation isn't very specific about what constitutes industrial action and taking any action that may be defined as unofficial industrial action would be very unwise.