These two colour-ringed Mute Swans were at Blunham Lakes on 1st November 2011. They were both originally ringed on The Embankment in Bedford. 772 was ringed on 11th March 2011 and this is the first time it's been seen away from the ringing site. 984 was originally ringed on 15th July 2011 and has been seen at Priory CP on 10th September, before turning up at Blunham.
Many thanks to the BTO, and Mike Reed in particular, for the information above.