Language campaigners say Welsh is under threat on Anglesey because town hall bosses want to give official status to English in a new policy.

Cymdeithas yr Iaith Gymraeg (The Welsh Language Society) said the policy, discussed on Monday, misinterprets the latest language legislation.

The group maintains the 2011 Welsh Language Measure only gives official status to the Welsh language and establishes that it should be treated no less favourably than English.

Cymdeithas say Anglesey’s proposed policy gives official status to the English language and states the two languages should be treated equally.

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In a letter to the council chair of the Gwynedd and Anglesey region of Cymdeithas Menna Machreth writes: “It appears you have mistakenly used the old principle in the Welsh Language Act 1993 of treating the two languages on the basis of ‘equality’ instead of ‘treating the Welsh language no less favourably than English’ as is required by the current language law.

“Clearly this mistake has occurred because [clauses in the policy] have been taken straight out of the old language scheme – without adapting them to the present legal framework.”

She asks for confirmation that the authority will “correct these errors straight away” and ensure “up-to-date guidance” is available to officials.

And the campaigner maintains Welsh should be the only language used internally by the council as happens in neighbouring Gwynedd.

The authority is also criticised for asking Welsh language groups to present written correspondence to council public meetings in English as well as Welsh.

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The campaigner maintains this is forcing English on Welsh language groups.

A spokesman for the authority said they would finalise revisions and amendments to the policy before it’s presented to the full council shortly.

“The county council will, of course, ensure that the policy conforms to the relevant legal framework,” they added.