UKIP's ruling body has agreed to campaign against devolution in Wales, calling for a poll on the future of the National Assembly for Wales.
It wants a referendum in 2024, on the 25th anniversary of devolution.
Gareth Bennett, UKIP's assembly leader, was elected last summer on an anti-devolution platform which was not UK party policy at the time.
Welsh Tory leader Paul Davies said it was "out of the question" to think of abandoning the Senedd.
The change, which would see the party campaign against the institution if any poll was to happen, was adopted by a unanimous vote of the party's National Executive Committee.
Mr Bennett: "Devolution is a white elephant which has added nothing to the welfare of people in Northern Ireland, Scotland or Wales. The devolved assemblies are a waste of taxpayers' money, and need to be scrapped."
"What the UK clearly doesn't need is this tier of extra politicians who add no value to public life.
"Most indicators show that Wales' performance has got markedly worse since 1999, when devolved government began. We have to accept that devolution hasn't worked for most people."