Jackie Lawrence was one of 18 CNP vice-presidents

Jackie Lawrence says the CNP has a "blinkered and pedantic" approach in taking legal action to overturn planning permission.

It is taking the Pembrokeshire Coast National Park Authority to the High Court after members passed the scheme.

The CNP says it is disappointed the MP has stood down as a vice-president.

For a charitable organisation which receives core funding from the taxpayer to effectively seek to override local democracy is simply not acceptable Jackie Lawrence MP

The park authority gave the scheme - part of which falls on its land near Narberth - planning consent in January.

Bluestone's backers say it will create 600 jobs and boost tourism.

But the CNP, which acts as a watchdog for national parks, says the authority has contravened its own policies

In her resignation letter the Labour MP for Preseli Pembrokeshire said the CNP's case appeared weak and was little more than a delaying tactic.

She said there had been a full democratic debate balancing the importance of the park against job creation and the economic benefit to Pembrokeshire.

"I take great exception to CNP's blinkered and pedantic stance on Bluestone," she said.

The CNP currently has 18 vice-presidents who act as advocates for the organisation.

Plans include 340 log cabins, a snow dome and a sports club

Ms Lawrence added: "CNP seem simply unable to accept that they have fought their corner on this issue but their arguments have been defeated in the course of the democratic process.

"I believe their decision to seek judicial review is little more than a delaying tactic.

"For a charitable organisation which receives core funding from the taxpayer to effectively seek to override local democracy is simply not acceptable and I no longer wish to be associated with it."

The �60m park would include 340 log cabins, a snow dome and a sports club.

CNP chairwoman Kate Ashbrook said: "Although we have been aware of our different positions on this issue for several months we are extremely disappointed that Jackie Lawrence has decided to resign over Bluestone.

"However we are buoyed by the calls we are receiving from across Wales and wider afield from people who are concerned about the Bluestone decision and who support the decision to challenge this in the High Court."

Bluestone chief executive William McNamara welcomed Ms Lawrence's stance.

He said: "CNP are a well-informed lobby group and yet have taken five months since the original planning decision to make a challenge.