Proposed London skyline
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London's future skyline in doubt, says Pinnacle architect

19 November 2012 Last updated at 22:22 GMT

The tallest skyscraper planned for the City of London may never become reality, its lead architect has admitted.

Construction on the Pinnacle began in 2009, but has repeatedly stalled.

Work is not due to resume until 2013 - by which time it will have stood less than half-built for almost 12 months.

BBC London's Matthew Morris spoke to Jerry Swain from the Union of Construction, Allied Trades and Technicians (UCATT), Pinnacle architect Lee Polisano, and London's Centre for the Built Environment's Peter Murray.