Graeme, I love that full susser, never seen that before - nothing is as new as you think is it.
I like the look of the highpath in that mag too a bit different and more trials like than the others I have seen, what year is it?
The Whippet is even more impressive than it looks in that the suspension system locks together the movement of the front and rear wheels. The effect of this is to virtually eliminate most suspension' squat dive and lift during acceleration, hill climbing and braking. Muddy fox had a similar interconnected suspension system on their top of the range, 1990's "Interactive" model.
http://www.retrobike.co.uk/forum/viewto ... 89c7a6493d
In many ways the Whippet's system is simpler and more elegant than that used on the Muddy Fox's.
Highpaths with frames like this first appeared in 1986.
They were known as Highlights, though the first I recall was called the Speedlight. It was fitted with wide drop bars, 650b wheels and intended for racing.
For slippy, algae and moss coated surfaces, I recommend tyres with tungsten carbide studs intended for use on ice. Schwalbe make a version where the studs only contact the ground when you drop the tyre pressure. This way you don't have to put up with high rolling resistance and sound similar to that of a deep fat fryer when you ride on tarmac.