If it comes as a surprise to you East Anglians to see more traffic, it came as a bit of a shock to me when I was a passenger from EGPF to EHAM a month or so back. It was a glorious cloud free day and idly gazing out of the window I was able to see Newcastle, the North Yorks Moors, the Humber bridge, the Wash, Norwich...
Despite doing the Montrose sector, which goes down as far as Scarborough, I hadn't realised just how far south we would go before turning left across the North Sea. (Had I put the coastline map on the radar before I went it would have been a dead giveaway).
In the good old days traffic from the Scottish TMA coasted out at Newcastle and went in a straight line to EHAM. Alas, the MOD have insisted that a bloody great danger area be placed over the North Sea which means all the air routes have had to be shifted around it. This is the real reason you are seeing more stuff over the north Norfolk coastline; in an ideal world the airways and UAR's would be a bit further north.