Just had same problem. Parked Freelander (petrol 1999) on drive went back to it 10 mins later, central locking inop. no ignition and red immob. light on in dash. Read every thread/forum on the web looking for answers but they all sounded rather expensive. asked an 'old timer' and he said that on the old Rovers the trick was to undo the pos. terminal from battery and touch it back on a few time as this sometimes shocked the imob. back into life. I tried this and it worked. just need to remember to always carry a 13mm spanner with me!
colin gilbert, October 2014