a note of caution
This may be a tactical u-turn before the next election ( we had a mini-manifesto yesterday). If Labour manages to scrape a win then this may well become compulsory again.
They are spending a lot of taxpayer's money on a 'voluntary' scheme, and this lot like to control and monitor everything.........
You may also get council run airports in Labour controlled areas trying to bring it in for airside workers as an 'additional security measure'.
S78