You are correct about LH. I worked in MUC for 18 months and an ever expanding set of destinations. However, bear in mind that .de is very much larger than .uk and so may be easier to justify two major hubs.
That said, BA has tried it before (as above). I guess that we are lucky in having many carriers supporting our regional fields, so a txfer via AMS/BRU/CDG/FRA/MAD is not unreasonable.
I am lucky in that I have lived within 35 miles of LHR for 23 years, so connections are not something I know much about!