I have a Focus C-Max 55 plate 1.6 Zetec petrol with about 33000 miles on the clock. A couple of times recently it has had trouble starting. It has turned over for a quite a while and then started, but then as I drive off the immobiliser red light has done something a bit odd: it flashes rapidly on and off for maybe 5 to 10 seconds, and then it moves into a sequence of one slow flash followed by a series of three slow flashes, and back to one, and so on, and then after about a minute it stops, and I carry on driving normally. I haven't noticed any difference in engine performance apart from the fact that it occasionally doesn't start first time. My best guess is that the immobiliser warning light is trying to tell me something, but I can't find anything about it in the owner's guide or on the internet. Anyone know what this means?