The future of Oxford University's library service depends on the Bodleian getting the go-ahead for a £29m book depository, a planning inquiry heard today.

The university told the inquiry that the depository, on the Osney Mead industrial estate, was crucial to the long-term future of the world-famous library in Broad Street - and the whole service.

City councillors turned down the plans last year, prompting the university to appeal.

The university's QC, Keith Lindblom, told the inquiry at the town hall: "The uncomfortable truth is that the collections of the Bodleian Library have outgrown the space available for them.

"In simple terms the need is for a modern, purpose- built facility which will ease the unmanageable strain on the Bodleian's existing historic buildings, while providing secure and sustainable accommodation for its unique and extensive collections.

"Only if this is accomplished can the university make progress with its strategy for the library service."

Objections to the scheme include the building's impact on the historic 'dreaming spires' skyline.

Steven Sensecall, for the Oxford Preservation Trust, said it was ironic that the "very body that created the dreaming spires is now proposing development that will cause significant harm to that same landscape."

The inquiry continues.