Roach was designed by Norman Dallimore and built by Stebbings in 1953. Her design was a re-working of the Burnham Sloop, the first of which was built by Priors. Roach and her sister ship Branklet were both chartered out by Blackwater Yacht Charters of Maldon, as was Souris, who may have been another sister.
Much more information Roach and her restoration can be found on the Roach’s Adventures blog. (A couple of the photos above have been copied from this site, the other is courtesy of Will at the Norman E. Dallimore Association).