[RoverP480]

I suspect the police will just check up on the MOT status and take it as read if you get pulled. I would concur that 1.6mm is too little tread depth on modern wider tyres. I had a loan Rover 45 from work and was driving home in the rain and every time I drove through even a small puddle of water I was getting a thump through the steering on exit. The tyres were aquaplaning even at 25/30 mph in town . Fortunately there was the tyre renewal authorisation in the car so took it to the tyre dealer and both fronts were on 1.6mm . New tyres , no thump. I now change mine at 3 mm