Unfortunately, it is the chain. Distributor rotor can be manually turned cos no link with chain. Took the camshaft cover off and there it is...broken chain. It was probably on its way when I changed the tensioner due to rattling at high speed.
Made a mistake by taking the whole length of chain out, should've waited till I got the replacement and would be easier to feed through.
I'll do better on the TDC positions on the following:
camshaft groove, crankshaft pulley marker, rotor notch, cylinder 1 and re-assemble tensioner before refitting. Have I covered everything?

I also discovered that the aux belt tensioner cannot be tightened, just sitting loose. What damage could this have caused? The belt appears to be tight enough.

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'92 190E 1.8