Warmtoast,
you are correct the AQM galley was just aft of the Signaller's radio stack on the Hastings. When I visited TG 528 when she was at the now defunct Syfame Museum at Staverton a young chap showed me around. When we got to the galley I put my hand down the soundproofing and produced a stick of paper cups and a pad of trimsheets . He was dumfounded until I explained that was the normal stowage for these items !