London Uniteds first trolleybus - aka "The Diddler" - did pay a couple of visits to the East Anglia Transport Museum and actually ran there on those occasions - even if its last use in London for the 1962 Closure events was a long while ago....
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This was taken in 2012, 50 years on from the final day in London, but it's highly unlikely that it will run again due to the state of the wiring.