Yes we are self certifying ourselves but we are restricted to walks of 1 to 2 kilometres and not on bikes. If I walk up the lane with my dog but without my printed and self certified form I am liable to a fine.
At the moment I'm not allowed to visit my partner who lives 3 kilometres away and...
Oddly enough it was a similar statement last Monday evening by Macron that it finally sunk home to everyone here, the importance of staying at home/away from others. Attitudes changed overnight.
Good luck to you all in the UK.
We've had just over a week of it here in France.......it's a bit surreal the first few days and then reality settles in and it's not so bad.