Maybe because I had work to do in London and was not too keen on wasting 2 x 15 min?

But anyway: Via LH's U.K. reservation line I was able to figure out the number of LH's ticket desk @ LCY, asked them to get my luggage out and afterwards I drove over to pick it up. Worked fine and I catched LH4779 back to DUS - that's Canary Wharf - LCY - LHR in less than 90 minutes.

But LCY was a real mess. A Tokyo subway during rush-hour is at best an empty desert in comparison...

Btw: LH's LCY operations will resume this coming morning.