Merryterry wrote:
So why are they still being imported if they're unsafe ?

Water Regs do not make it illegal to sell non-approved fittings but
illegal to fit them.

Do you have an authoritative reference

Yup! One of the worlds leading experts on Legionella.

can you name them, please. and could you cite references ?

I would genuinely like to know. specifically, I would like verifiable references
to scientific papers for business, legal & (worryingly) insurance reasons.