Hi Georg,
There are lot's of Gerrmans alreay working for a number of Airlines such as Ryanair, easJet, etc. based in the U.K.
Don't worry about work permit, insurance etc. It is the EU. These are just paperwork exercises and will not be a problem.
I suggest a search on this webite regarding the employers you want to know about. Don't expect too many answers here if most of the inormation you are looking for is already in other threads.
I do think you might need to be a bit flexible with your choice of base, though.
Have you thought about NetJets? They are not currently hiring but probably will by the end of the year.