I introduced Acklington in that Spitfire squadrons that went to Biggin and came from there operated from Acklington, so there could be a futher reason for a 'Biggin' based/bound Spitfire being in the area. I missed
EG's post that stated the gent went to Turnhouse to report in afterwards.
This site is pretty good regarding losses in the borders area
Aircraft and Airmen losses in North East England
Nothing immediately fits the bill in their listings.