S/Ldr Zumbach Bar to DFC decoration at Kirton(?), 1942 - looking for the date

[VoyTech]

Sometime between late September 1942 and late November 1942 S/Ldr Jan Zumbach, commanding No. 303 Squadron was decorated with a bar to his DFC. I believe the ceremony was held at Kirton-in-Lindsey, where the squadron was based at the time. During the same ceremony two other pilots of the unit received their RAF decorations: P/O Antoni Glowacki the DFC and F/Sgt Mieczyslaw Adamek the DFM. I am trying to find the exact date of the ceremony and to confirm that it was indeed at Kirton. I also seek confirmation that it was AOC No. 9 Group that decorated them. Perhaps someone with access to RAF Station Kirton-in-Lindsey or No. 9 Group records can check that?