'Cygnet' is the oldest working Thames Sailing Barge/Yacht still in existence, she was built in 1881 and can often be seeing either moored up at Snape Maltings or sailing the River Alde or visiting other such places
One vessel that will be appearing in the flotilla will be MTB102 which is now based in Lowestoft, I have seen her many times and it will certainly be one I shall be looking out for on the Thames read about her magnificent history here http://www.mtb102.com/