Yep, handcyclist is my very good friend Ken (he was waiting for me for a coffee at the time!). I had a go, and it's the strangest, least intuitive, hard work experience. But at the same time utter fun (especially when he suggested riding round the corner to bump down a kerb and see just how much the three(?!) shock absorbers smooth everything out.
He's got a road bike coming too, which in more 'traditional' handbike form is a recumbent, and the handcranks are moved in the same plane at the same time (whereas on this monster you are pedalling just like on an upright), with the handcrank also steering.
Ken Handbike_6 by Anthony Robson, on Flickr
Ken Handbike_2 by Anthony Robson, on Flickr
Ken Handbike_7 by Anthony Robson, on Flickr