This is a fair question. AS far as I could see, not dealt with in easily-found on-line or printed war decorations booklets and refs:
Duckers British Campaign Medals 1914-2005 is silent, eg, as is the official UK Medals Office summary.
First off, it's worth noting that search on 1939-1943 Star vs 1939-43 Star or 1939-1945 Star vs 1939-45 Star gets different results.
There's no apparent ref to the 1939-1943 Star in the London Gazette.
In war-time, only campaign ribbons were issued (eg 1939-1943 Star, Africa Star).
The 1939-1945 Star was first included in the Order of precedence published in the London Gazette 7 Feb 1947.
Discussed a number of times in UK Parliamentary Hansard as 1939-1943 Star on at least 5 occasions from 1943 to Aug 1944.
Eligibility for the 1939-45 Star was being discussed by 30 May 1945.
By Dec 47, the actual issue of campaign stars was being discussed, referring to designs published in UK national newspapers in March 1946, with the striking of medals to begin in 1948.
The naming change appears from these refs to follow close on the end of the war in Europe, by late May 1945, and certainly before March 1946.
It's possible that the detail is covered in either
Gordon British Battles and Medals (1979)
or
Spencer Medals: The Researcher’s Guide (Kew, 2006)
or, it may be something that is worth asking the Medal Office: DBS-Medals@mod.gov.uk
or possibly (if a reliable on-line set is found) in Air Ministry Bulletins or AMOs
There may be a medal expert here to amplify/correct the above or there may be a useful Medals forum somewhere.
Sources: as noted or linked
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