There was an article linked from the C.H. Lightoller Appreciation Page on Facebook (um...I'm kind of a Titanorak. And Lights is my particular area of interest.) Had a picture of Sundowner and comments from another owner of a "little ship" from Dunkirk on how potentially tricky the 'parade' was going to be.
I am going to have to google pictures of the war canoe! I've seen one in New Zealand, but that was just on display. Paddling down the Thames would be a sight to see!