Restricted Area - Durham

[ximi]

It only applies to helicopters I think - there is another thread about it here:

Why is there such a large restricted arear around Durham/Frankland

Brand new drone owner (Teesside), just browsing drone flying locations and noticed the seeming massive restricted area around Durham and Frankland prison aka FRANKLAND/DURHAM zone I can understand a prison, however even then restricted area covers a massive amount of land in comparison to other zones (and prisons), most of the city is also covered. Why so large? Is there any oversight to the assigning of areas or has someone just got out a big red pen? Other restricted areas seem very specific…