The design includes two 44-metre-long arms, capable of swinging open when required. That operation is controlled by a hand-held remote device but that device went missing some years ago, meaning openings were no longer possible.

The Authority — which is set to be wound-up in the coming months — moved offices several times in the past few years, and it’s understood the remote (which is about the size of a 1990s-era mobile phone) may have been simply misplaced in the move.

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