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Taken from the IWA Bulletin dated 29th April 2016https://www.waterways.org.uk/news_campaigns/bulletins/iwa_bulletin_20160429
"Luddington lock is now the site of the old footbridge over Bancroft Basin Lock which was built by prisoners in 1963 at their workshops in Wormwood Scrubs, London, placed in position by the Royal Engineers, Long Marston in 1964 and installed by prisoners from Winson Green in Birmingham. Volunteers took the opportunity to bring this iconic structure back to its former glory."
The bridge is on the site of the original round Upper Luddington lock.