It is rather interesting to notice how Rotary mowers still variate between markets.
In Australia, the most common set up is a simple steel base, four wheels, non propelled with a single height adjuster, till recently the most common engine was two stroke, however cost and environmental factors have changed this.
In the US, from my understanding, the most common set up is a belt driven, non catching, bar blade, 4 stroke rotary, with four wheels set by independent height adjusters.
In the UK, the Rotary mower seems to more often than not be a rear catcher device, with a combination of either two front wheels and a read roller, or a front and back roller, self pripelled by the rear roller.
Indeed the rotoscythe itself fit's this bill, and while we view it as a rather heavy beast, at the time in the UK, it would likely have not been considered so, it is lighter than many cylinder mowers, and due to the prevalence of cylinder mowers and a reluctance to simple non catcher electric rotary's, it would have had far less lightweight competition back in it's day.
Interestingly, it still was not a phenomenon over there in the way Victa was here, but it holds the base design principal that still sits firmly at the heart of modern rotary's in the UK.
I would go so far as to say that the simple, pressed steel, rear catcher baseplate we are so used to seeing today, is still, uniquely ours, at least in it's popularity, while the idea of rollers on your rotary remains something specific to the UK.
