Bunker Wind Down

By 1943, the air defence requirements had changed, with the increase in offensive actions against occupied Europe and the reduction of massed bombing raids on Britain. 13 Group was amalgamated with 14 Group on the 15th July 1943 and the site was renamed RAF Blakelaw becoming a Sector Operations Room for Catterick and Ouston Sectors.
12 Aug 1945 was VJ Day and this marked the end of RAF Blakelaw as an active station and round the clock manning was left to a skeleton crew
This change in role meant that the Filter Room became redundant and was taken over by the Military Police in June 1944. The exact role of the Blakelaw bunker at this time is in some doubt; there were proposals to establish a joint USAAF/RAF command centre or even to convert the site into a Maintenance Unit but neither of these appear to have come to anything.