Those readers of a certain age will remember Kick Start, a fun for all the family television programme in which amateur motorcyclists rode their steeds over and around an obstacle course comprising hay bales, planks and cabers. Inevitably, the rider would fail to ascend a vertiginous mud bank or tumble into a water trough, much to the hilarity of Dave Lee Travis and those watching at home. Such schadenfreude is at the core of the Trials franchise, in which the gamer rides a motorbike through increasingly ludicrous tracks while trying not to plummet to be bottom of a ravine, into a pit of…