If it had a pub and a windmill, I expect there was at least a jeep trail running through. Otherwise how would the pub have resupplied or farmers gotten grain to the mill? This would count as a "road" in the parts of North America and Asia you're talking about. Therefore the "three mile" claim is bogus.
My gut reaction to your question was to answer "by train". Another option might (considering it's in Norfolk), by canal.
Then I thought I'd better look it up.
The comment in the article was about Berney Arms[1]. Looking on the map, it looks like the station is indeed unserved by roads. However, the nearest road does appear to be 500 metres away (much closer than three miles). The pub and windmill are on that road, rather than at the roadless station.
The next junction along that road is about 2km away (still not 3 miles), and the nearest meaningful junction (i.e. that gives you a choice of destination) 3.5km (still not 3 miles).
The nearest junction with an A road is about 3 miles away, following the road. It is also the closest you can get with Google Streetview[2]
A47 appears to be less than a mile away according to Google Maps scale bar. Walking to Great Yarmouth is listed as .1 mile (I don't know how though since I don't see any bridges across the water).
In addition, that's a stop along the train line to Great Yarmouth which isn't exactly nowhere. So, are they running a train only to Berney Arms? I doubt it terminates there. Now, it could be that passenger service is sparse because it follows the geographic feature (the river) rather than cutting through like the roads.
Finally, a lot of this stuff stems from the massive cuts that the railways took in the 1960's. That area used to have a lot more rail lines.
