On page 298 of the book "A Pride of Eagles A History of the Rhodesian Air Force"
https://books.google.com/books?id=Rl...R%2021&f=false
there is this sentence: "On 19th April, (1947) another aircraft joined the fleet, an Avro Anson numbered SR 21."
The same page mentions a Leopard Moth SR 22. Another page says SR 22 was taken on charge in March of 1947. Not sure why the numbers seem out of sequence with the dates. At any rate, the post war sequence may have started with SR 21.