Seem to remember that Keo beer gave one a headache
and a pain in the kidneys.
It was rumoured that analysis of it showed it contained 13 poisons including traces of lead and arsenic.
Also remember that brandy was cheaper than Lucozade, so standard cold/flu remedy was to retire with a couple of jugs full of brandy sour.
Akrotiri, a three-year gap in reality, absolutely loved it.