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.

You wouldn't be making a clumsy attempt at advertising, would you ?

Nope! Just trying to shake everyone out of their torpor when it comes
to buying a potentially harmful product. The Merchants dont give a
toss. If they are cheaper they will flog them.

You are right about the Regs and the enforcement of them. They are
toothless.