I agree, kendall, that everyone has a mobile phone these days. But here there just isn't any kind of signal. Norfolk is a notorious flat spot for phone signals and also Broadband speeds. Mine is in the car but never turned on, as it's pointless. Only in Norwich does it work.
Secondly, I don't believe this woman even wanted to overtake me. She could have done so at almost any time, as the road was completely empty. She must have been fiendishly enjoying hassling me; I can think of no other reason.
I wouldn't dream of 'teaching anyone a lesson' on the road. I merely wanted to finish my journey in safety. I never drive on a Motorway, because, as I said, there are none in Norfolk. But in the past I have done so when visiting Prisons. I've been all over England doing that, and the only problem was that my tiny car could be unseen by huge lorries, and sandwiched in between them. I'm fascinated by the number of posts on this thread. It seems many people have had similar problems with tailgating. It's an aggressive world out there on the roads apparently!