Stuck swan

We were at Lakenheath on Wednesday pm (on way home to Northamptonshire) and were pleased to hear our first grasshopper warbler in a bramble patch along the raised river bank. However, we then came to the dried out pool next to the river (not actually on the reserve) and saw a swan apparently stuck in the middle of the mud. It's feet and legs were submerged and it had no food within reach. We reported it at the VC but were not impressed by the response (not our job). Did anybody else see the swan or know what happened to it?