There was a revival of the Prestwich Sloopy in 2011 which was being handled by Deakes Models. Unfortunately, a google for them shows the company as being dissolved in 2012.
There was a couple of them back in '96 when my club formed – very fast boats, very reliable self righting unless the driver had taped a flashlight to the top for night running (fortunately, a waterproof one and the propeller became a viable airscrew to get it back)