Miltary awards are published in the Supplement to the Gazette, and these are sometimes issued on different dates to the main Gazette. Further more, the award may have been made on 19th April and the details sent to the Gazette on the same date, but actual publication may have been some days or weeks later, due to the backlog. At the end of the war in Europe, there was a huge list of individuals who received awards such as the MID for their war service.
Don't expect to see much. An MID won't have the actual citation recorded in the Gazette, just the fact that it was awarded, which of course you already know.
