On a roll... Went to start the van earlier, started. Went off for a spin to try out the new tyres, all good. Came home, changed the oil, went to start it... Nothing. Solenoid clicks but starter isn’t doing its thing. Put the van in gear and rocked it. Nothing, just the click. Hit it with a hammer a couple of times, still nothing. So is it stuck, or just knackered?