Ethics code needed on face recognition, whoever is using it

■ Ed Bridges is taking the police to court over automatic face recognition cameras, claiming it’s an invasion of privacy comparable to taking everyone’s fingerprints (Metro, Wed).

Google, Facebook, Amazon and other commercial enterprises are also using facial recognition to enhance our purchasing experience and we seem to have no problem with that.

Opinions become quite different when it’s government- or security-related, however. What is desperately needed is a ‘Geneva Convention’ on the ethical and appropriate use of facial recognition by government agencies.

Cool heads must prevail. We have to be very careful about instigating wholesale bans on this technology. Doing so could limit its future benefits, which might have a negative impact on national security and even cost lives. Brad, Edinburgh

■ I get a bit fed up with do-gooders like Ed Bridges. I am by no means a police lover but if this technology catches one terrorist, one murderer or a missing person then all power to the police. Bob Carl, Billericay

■ I have been law-abiding all my life and have nothing to hide but this is taking us ever closer to a police state. Cameron Norman. West Yorkshire

■ Ed Bridges is right to challenge the police because they hold a ‘Matrix’ database on innocent black people, which messes up their lives. Juliet, Putney

■ I was recently on holiday in Cyprus when a Norwegian couple asked me what I thought of Brexit, quickly followed by a fit of giggles. We are the laughing stock of the world. The British public were asked to vote and we did – we voted out. What the world is laughing about is that we preach democracy yet can’t actually give the British voters what they want. Pam Williams, Frinton-On-Sea

■ Tory defence secretary Penny Mordaunt’s rant against Jeremy Corbyn, aimed at distracting from Labour questioning about collusion in torture by Saudi Arabia, listed foreign policy issues on which she claimed he had been wrong (Metro, Tue). She failed to mention that Mr Corbyn opposed Tony Blair’s Iraq war while almost all Conservatives supported it. I wonder why that was? Christopher Clayton, Chester