I called DH this afternoon to remind him I'm out on a course tonight & ask him to put DC's dinner in the oven as he was due home first. Mid conversation his phone cuts out but as I'd said everything I needed to I just assumed he was with a customer & didn't call back. I arrived home at 7pm with starving & tired DC to find the house in darkness & raw chicken sat in the fridge 
He's still not answering his phone or replying to texts, my course started an hour ago & kids had to have beans on toast.
DH does have form for disappearing (50% of the time to the pub the other 50% work related) so my initial reaction is to be fucking furious but as time goes on I'm starting to get worried that something awful has happened. Should I start ringing his mates/work colleagues or sit it out a bit longer!?