Surprised - when I Search on SeSco for RAF Blakelaw - I find zilch.   OK  Blakelaw (Kenton Bar) is not in Scotland (it is immediately North of Newcastle-upon-Tyne).  However it was the HQ for 13 Group that covered all Scotland  

http://www.bunker13.co.uk/html/history.html

Researching about Rudolf Hess flight , in books often either RAF Usworth (Sunderland) or RAF Ouston (West of Newcastle-upon-Tyne) , now known as Albermarle Barracks.  It is hard to determine if it was Usworth or Ouston calling in fighters on 10/5/1941.

Obviously RAF Blakelaw was receiving radar input from Ottercops Moss (first to detect) and ROC from Durham PO (that would be Silver Street, Durham City) and from Scotland.

It is known that Hess was travelling very fast when he crossed the Northumberland Coast ,   RAF Acklington was very slow in getting Sgt. Pocock into the air to intercept (Hess was well into Scolland by then)  ,  does make me wonder if RAF systems of the time were fast enough

Try searching here and in the wiki for '13 group'.

Regrettably - but as now seems to becoming usual - the MoD has now removed the original page that provided the information used.

The power of the Search facility  

I haven't got any reference books with me but RAF Group boundaries were not fixed permanently, they changed from time to time.  Scotland was 14 Group for a time - Fighter Command of course as other commands presumably had their own groups which also changed from time to time.

I am not sure if Fighter Command boundaries would have changed all that often as they had overall command over all anti-aircraft defences i.e. Balloons, searchlights and heavy and light anti-aircraft batteries.  Roof Over Britain 1943 (not a quote).

It would have been an admin nightmare.

quite

http://battleofbritainbeacon.org/faqs/raf-fighter-command-battle-of-britain.cfm