I just discovered that you can go from #Munich to #London by #train really really easily:
1. Nightjet 486 departs from Munich at 23:16 (3x / week)
2. Arrives Paris Est at 9:38
3. Take a Eurostar from Paris Nord, they run roughly once per hour
4. Arrive in London 2.5h later, e.g. 13:30
In terms of "active time spent traveling", this is as good as flying (get up early, head to airport, fly, train into London).
It's more expensive though, because capitalism.