I have a W reg Ford Ka and it won't start! Battery ok and alternator fine too - can bump start it and it runs like a dream once it's going. Was wondering if they have some sort of immobiliser on them - basic model, no central locking, problem with drivers lock anyway - can't unlock it from outside (this has been a long term problem). When I put the key in the usual lights come on - then the seatbelt and temp lights go off leaving me with my oil, battery and handbrake lights on - when I go to turn it over it makes a whirring noise for a few seconds and won't turn over. Any suggestions please???