Several times I have posted about how Thyroid, BP eventually disappeared (from the 1980 British Pharmacopoeia).
However, I have now added several additional letters in a thread over a few issues of the British Medical Journal. They add some depth to the story.
Have a look even if you have previously seen my document(s).
helvella - The End of Thyroid BP
A brief note of one public statement about the final withdrawal of the UK product, Thyroid, BP. I suspect it summaries the attitude of the time..