The instruction is to return to work were you cannot work from home and to avoid public transport were possible.
Flight instruction cannot take place at home and need not involve any public transport so hence is in full compliance with the most recent instruction from the Prime Minister.
As is some private flying of which some will be travel for business and professional reasons as opposed to recreation.
Although the instruction has only just been given the CAA are now lagging behind the Government.
It will of course be extremely challenging to mitigate the spread of the disease but stepping up to the challenge is better than rolling over and letting business die.