Thanks Sweet pea. It was the first scenic bit of the layout I completed. I adopted the @MrWolf (and others) technique for the water (several coats of gloss polyurethane varnish), I tinted the varnish with Woodland Scenics water tints. The varnish was painted on a sheet of clear plasti-card, which I've cut to fit between the canal walls. The canal walls are 7mm embossed plasti-card, the walls on the tow paths are 4mm embossed plasti-card. Towpath surface is Redutex cobblestones.
Best Wishes
Clive