Thank You all for your comments.
So, I returned to Manchester at 15:30
Walked behind my wife to the electronic gates she went first it halted half way through the passport official told her to raise her glasses and keep staring at the screen, it flashed a few times and she was through.
My turn, it scanned my passport, I could see my face on the screen , white light, I stood still, got nervous and looked a few inches higher, the white light moved with me, still saw myself on screen and then.......Pleasd seek assistance!!! damn.
I was directed to the desk, young official, she scanned my passport, I asked her why this passport had never passed the auto screen, was there something wrong with the chip?
No she says, the chip is fine, she was pleasant, joking and basically said that it was my fault for not using the gate properly!!!!
So, non the wiser, if I am to believe a young, bored, jokey official then my passsport is fine but I need to use the gates better...
I didn’t press the issue, she was really friendly, but I lost the nerve to ask if there were any flags on her screen, I only asked if I had a dodgy chip or was there something else wrong to which she replied, no, all is ok, the gates are sensitive sand haven’t recognised me sufficiently.