A star rating of 4 out of 5. Jeremy Clarkson is unwell. His jolly reality doc, set on his Diddly Squat farm in Oxfordshire, returns for season 5 with the presenter/landowner in hospital, barely surviving several blockages around his heart – when he does put his waxed jacket and wellies back on, he’s under strict doctor’s orders to take it easy. No booze, no red meat and no stress or manual labour allowed. He’s definitely not supposed to argue with right-hand man Kaleb Cooper about the correct shape of a bonfire, help a vet launch a dead sheep into the back of a Range Rover or become apoplectic at Rachel Reeves’s budget hitting farmers with extra tax. Clarkson’s Farm, however, has always been about its host doing things he’s not supposed to do, so, of course, he quickly steams into all of the above, and we’re back into the show’s normal rhythm: pratfalling ineptitude punctuated by genuine concern over the plight of the British agricultural industry. Meanwhile at the newest Clarkson venture, his gastropub the …