As usual, the regulation and reality don't tally. Many airfields are shut anyway with the exception of essential flights - i.e. Air Ambulance, Mil, commercial PSOs, cargo/mail. You might "need" to ferry an a/c to another airfield for Mx or give the engine a run however upon phoning for PPR - from either your departure or destination airfield - you will be told in no uncertain terms to bog off. Plus if Plod turn up or the local NIMBY/Curtain Twitcher reports you they will be giving you a telling off and relieving you of some hard-earned for your trouble.
A better admission would be "We know everything's screwed, basically nobody do anything and wait until all this is over and sort it out then".