Just another indication of the way Covid restrictions can be tightened.
There is a need to reduce contact further. Saying you cannot travel more than say, 25 miles from home wouldn’t be workable but you could more easily ban travel from one county to another even if it does throw up a lot of anomalies where boundaries are not necessarily logical. The eastern bulge in the Suffolk boundary to encompass Newmarket is a good example. Driving along the A143 from Scole to Gt Yarmouth is another.