Social distancing is the obvious issue, as is the problem that is you have an 'incident' that requires the emergency services to attend then you are depriving others of that essential service for the sake of your hobby and self-indulgence.
This is the line taken by the LAA.
Private flying is way down the list of activities to be undertaken at the moment.
Two examples of the shortage of emergency response:
A friend of mine had a heart attack just over two weeks ago. He managed to reach home to dial 999. The response was 'sorry, we have no ambulances available at the moment'. His partner drove him at high speed to Preston - and then he was taken to Blackpool for specialist treatment. He is recovering, but it was a close call.
The second example, sadly, involved my 9 week old granddaughter. The delay in response mean't she died before the ambulance arrived. Attending the funeral of a baby is not something I would want anyone to have to endure.
So before you think of recreational flying with your mates, remember there are others who may suffer if you should have issues as a consequence of your own enjoyment.