Subaru wouldn't start for SWMBO earlier, till she remembered about the immobiliser timing out on that car, if you don't turn the ignition on within about 30 secs of unlocking the car, when you do turn the ignition on it won't turn over, you have to press the plipper again with ignition on, then it will start up, ISTR Rovers and Land Rovers having a similar time out system.

She mentioned this and i wondered what would happen if the battery in the plipper went flat, so tried it without plipping, car opened on the manual keylocks fine but alarm went off soon as tried to start the car, nothing to be done about this.

Hmm, that prompted a half hour renewing all the batteries in the various fobs, and a spare battery to be placed in the glovebox of each car.

Might be worth checking yours people, something we tend to forget, get those fobs open and see what batteries you need, maybe get a few in stock if you haven't, already.