Hi It was for health reasons, think it was hypo's they were concerned with, but it's so long ago since I worked for them I can't be sure. I too had to stop when I went onto Metfartin, was really miffed about that at the time.As a T2 only on Metformin, years ago, I was not allowed to donate blood, plasma, nothing.
I was not it was for own health in case I had 'a bad turn'.
Was never too sure - but as now on insulin too - it's a definite no no
We did on my team, more so in hot weather , we offered orange or lemon squash.And they like you to sit and drink as much water as possible before you donate - never used to bother about that in 1968 to 1972 LOL
My team were rebels lol. We travelled around , though my base was at Tooting. I loved it, their was never a dull moment.Not in the permanent centre in Brum, back then !