Labour will scrap plans for a #147 million library on split sites if the party regains control of Birmingham City Council next year.
Every attempt will be made instead to resurrect the proposed Richard Rogers-designed 400,000 sq ft library at Eastside, which the Conservative-Liberal Democrat controlled council has declared too expensive to deliver.
Ian Ward, deputy Labour group leader, hit out at the "crazy" plan to build the new library on two sites - the lending section in Centenary Square and the archives and reference section at Millennium Point. It would take Birmingham back to the 1950s, he declared.
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The proposal, first revealed yesterday by The Birmingham Post, will be approved by the council cabinet next week.
Coun Ward ( Shard End) claimed the difference in price between the split-site library and the Rogers design was "only #25 million".
Coun Ward also accused the Conservative-Lib Dem coalition of ignoring the recommendations in a consultants' report drawn up for the council.
The report by Gardiner and Theobald, which has never been published, is believed to have concluded that the Rogers library at Eastside would give the best value for money.
Coun Ward added: "We will not implement this crazy scheme if we win power in May. We will not support a scheme that does not deliver for the people of Birmingham.
"This is the worst possible option that they could have come up with. They can't demonstrate that they can deliver it, there is no detailed business plan and it confirms that they have no vision for the city and no ambition."
Failure to fight for the Rogers scheme exposed council leader Mike Whitby as a "small town politician without ambition", Coun Ward added.
Labour believe the running costs of a split-site library will be high and that it will be difficult to attract external funding.