Hi,
I wasn't even born then so I can't help you.
But, if you contact Southampton Hospital Medical Information service (google for contact details - can't find at the mo) they have access to a computer programme which can identify many many tablets (past and present, conventional and herbal, legal and illegal). They may not be able to give you 100% identification.
Have the following info ready when you phone cos they prob won't be able to help you much with the phrase 'ring shaped blue tablets'. Give approximate diameter (in millimetres); approx depth; any surface markings or letters.
Hope that helps.
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