Got a new fuel tap, and decided to have a look around and soon had the carb in bits (main jet partly blocked, some crud in float bowl), muffler almost completely full of soft soot, then took off the head, barrel and piston to check bore, rings, big end, little end - all in good shape, now running beautifully.

Two Victa things I like - when laid back on the handle it stays there, and the blade carrier is domed (convex upward) so the blades are angled downwards, therefore the tips contact the grass first, perhaps that's why the cut is very smooth?