Why is there a shift from BS to EN fire testing standards?

BS 476 standards have not been reviewed or updated since 1999 when the CPR decided that standards across Europe should be harmonised.
Approved Document B still references BS standards in some cases, but are referenced in footnotes and it is unclear how to interpret this correctly.
A recent government consultation has been published on the removal of BS 476 standards in Approved Document B with its European counterpart.
EN test conditions are known to be harsher and more onerous than BS. We are therefore confident that EN tested systems will pass BS standards.
Any future testing at Siniat will be to EN standards.

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