As I'm due to fly back to Germany from the UK with Lufthansa, their pages say "Lufthansa is currently only allowed to carry the following booked passengers on departures (or travel commencements) from the countries of the Virus variant areas: - Passengers with German nationality or passengers with a valid residence permit in Germany (upon presentation of a German registration certificate). " or in German "Passagiere mit deutscher Nationalität bzw. Passagiere mit einem gültigen Wohnsitz und Aufenthaltstitel in Deutschland (unter Vorlage einer deutschen Meldebescheinigung).".
So that implies I need to have a Meldebescheigung to get back into Germany, even though I have a permanent residence permit. Is that really so? Unfortunately I don't have one with me. I wonder if it's possible to get the Rathaus to send me one in a foreign country?