Well I had a 'strange' caller at my door. I was surprised to see him. He looked bewildered, I said hello, is this 91? yes I replied. He was puzzled, after a pause. He asked:- I've come for the games console? I said how did you arrive here? Postcode in Satnav. That was the solution wrong postcode. No. was right but he needed the block of flats on the next road. People with Satnav seem to blindly obay :)
May explain some of the other odd callers I've had in past. I always thought they were a windup!