Not sure if it's the same for everybody but mine, has had loads removed and chopped about with.
I have to put the key in. Click it to the first position (ignition off) then press and hold the key fob button and turn it to ignition stage 1 (ignition lights on the dash) this will then make the blinking light a solid red dot. Start the engine.
Then if I turn it off and just knock the key back one click to switch it off, it will start again as it doesn't re engage the immobiliser.
Sorry if that's long winded to understand