Mmmm ...
Anthony .. dear chap ... your answer depends on many things ... primarily
the aircraft type and its age ... also whether it is inside or outside ... and if outside what the seasonal conditions are and then whether the engine(s) had been properly inhibited or not etc etc etc.
The particular aircrafts 'Maintenance Controller' would be the appropriate person to talk too with regard those requirements ...
Most airworthiness authorities (and Insurance companies) will require at least that the aircraft has its 'Form1' (aircraft return to service) or equivalent be valid and signed off prior to any starts or runs ... and then of course any un-serviceabilities entered for action if found.
Cheers