If anyone can help the picture at the top shows a T code number I’m not sure what this means. The other picture won’t uploads but it gives a style code of: 7828 096.
The collar label says: St Michael Leisurewear Made In The UK in green.
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I'm still trying to determine a more specific date. The trademark for this version of the St Michael logo in this font was filed for (in the UK) in 1987, published in 1991 which gives a starting point:
https://trademarks.ipo.gov.uk/ipo-tmcase/page/Results/1/UK00001320157