I was due a breakdown. Pipe into the heater matrix, steam and the nasty smell of stale coolant. Swapped pipes, forgot to bleed the air out, then it ruptured dramatically!
Thanks to some great friends, I got the car trailered back home, and swapped in the remaining pipe, bled the system, and let it idle for an hour or so. New bits ordered today, so I'll replace them once I get back from #RRG14.