Seems that the cooling system was leaky at the radiator flange for some time (I'd been wondering where the wet spots under the car came from lately, but hadn't found anything while checking). I suspect that some air entered the cooling system there and / or it had dripped out enough water to affect cooling (I have to admit I haven't checked it regularly) and caused it to heat up so much, building up pressure all the while until the leaky spot gave away - meaning the flange broke off.
Luckily was able to fix it on the spot - there was still enough of the flange left to push the hose over it again and tighten it securely. For good measure, I used some sealing mass before hand, to ensure it didn't leak again. After some water refilling and bleeding the cooling system, it worked fine on the way home.
Fun fact:
This happed on the way to a spectator spot on the Nürburgring (Adenauer Forst), and as yesterday was easter friday, which in Germany is called "Karfreitag", there was LOTS of activey at the ring, as the german car scene goes nuts on Karfreitag, because for us it's "Carfreitag".
Hundreds of people walkind and driving by us as we had to stop there... I heard one of the passers-by shout out "Woah, dude! It's that Touring from Stanceworks, awesome!"

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