I've found my orange glow plug light flashes it i've got a bulb blown somewhere. First time was as suggested a brake light. Second time was one of the head lights. Not sure if this is the case for everyone, but worth checking all the lightbulbs. I also had it with a number plate lightbulb. Hadn't had the van long when this first happened and made me worry it was something drastic, but this forum really helped with sorting it out.