"Mentioned in dispatches"
https://en.wikipedia.org/wiki/Mentioned_in_dispatches#United_Kingdom,_British_Empire,_and_Commonwealth_of_Nations
You are welcome, M.
According to the Wikipedia article, the dispatches are published in the London Gazette.
I could locate the 30-9-1958 issue. In the column at the right hand side in page 5974, there is a list "Mention in Dispatches" for distinguished service in operations in Cyprus (under ADMIRALTY). Could not find John H Page in the list. There is also a supplement to the 30-9-1958 issue, Could not find his name there either.
Probably, I am missing something else, or date is not accurate.
Found him, M !!
Supplement to The London Gazette 26-9-1958
At the bottom of page 5953 and top of page 5954 (Under WAR OFFICE).
"The QUEEN has been graciously pleased to approve that the following names be mentioned, in recognition of gallant and distinguished services in Cyprus for the period 1st January to 30th June 1958:" ... Maj. J. H. Page, M.C. (251684) R.E. ...
"The QUEEN has been graciously pleased to approve that the following names be mentioned, in recognition of gallant and distinguished services in Cyprus for the period 1st January to 30th June 1958:"
...
Maj. J. H. Page, M.C. (251684) R.E.
Here is the link to the page in "The London Gazette" website:
https://www.thegazette.co.uk/London/issue/41508/supplement/5954
Maj. J. H. Page is in the first line.