We used to salute Winny and he wasn't even pm by then.
Ah, good point. Notwithstanding his prime ministerial rank or time in the Admiralty, he was a retired Lt Col (CO of 6 RSF in 1916 after his resignation from the Government after The Dardanelles). While not 'required', saluting a retired senior officer is an appropriate mark of respect. Now if we ever again have a Prime Minister who has served...