Manifesto launches are full of firsts. Some, I admit, are more unexpected than others. I don’t think I ever believed I’d be launching a manifesto with the help of a Shetland pony or a Clydesdale horse, or that I’d be driving a tractor resplendent with Lib Dem diamonds to meet a gaggle of journalists. But then, I’m a Lib Dem – did I really expect anything less?