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| If only there was a set of standards already in place that would set conformity of quality for goods and services in a transparent way 
British Standards | |
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In the 40 years that UK belonged to the EU those British Standards relevant for export products were either superseded by European (EN) standards or changed to align with the EU standards.
From your link "Following the move on harmonisation of the standard in Europe, some British Standards are gradually superseded or replaced by the relevant European Standards (EN)."
For example a list of 55 BS superceded in 2010
here.
Edit; one of these Japanese demands was "maintenance of harmonisation of the regulations and standards between the UK and the
EU (including the maintenance of established frameworks of mutual recognition and
equivalence);"