We have the same problem with friends up here in Scotland, Senofou: I have some of my Suffolk accent left, and my husband has his Devon one, but people assume we come from the same place! To me they are quite different! They don't roll the rrrs in Suffolk as they do in Devon - just elongate the vowels, as you do in your phonetic Norfolk!
But then, when we first came to live in Scotland - 35 years ago now - I couldn't distinguish all the Scots regional variations. I now know the Weegies (Glaswegians)from the Aberdonians and Edinburghers, and the Western isles from Orkney and Shetland. But my friends in West Lothian can tell if someone is from the next town 5 miles away!