Keep one thing in mind: Germany only allow dual citizenship with other EU countries. If the UK mess this up and crash out of the EU without a deal before you have achieved British citizenship, there's a chance the German government will ask you to choose between the two nationalities when you final...

Naturalisation is not affected by brexit (British nationality law). Guessing now, that UKVI will complete processing PR applications in their system, und you will use the PR document for the AN application. Settled status will also come into force after 29.3.2019 - with public beta open on 21.1.201...

I've been living in the UK for over 6 years and I'd like to apply for citizenship as soon as possible. I have applied for Permanent Residence a few days ago and will provide the documents via the European Passport Return service on Tuesday. What I'm unsure about is how this all looks with Brexit ahe...