MAYBE there will be no noticeable negative impact, but I highly doubt it. What do we (EU/GB or GER/GB) have to benefit from? I can not imagine anything.
We share an aerospace industry with great skills between them. We buy a lot of your goods such as cars. To name a few. The point is German companies have already piled the pressure on to put in place free trade with the UK. This is the win:win situation. This is what the EU is about. It isn't about creating a super state with countries not able to 100% govern themselves. The EU has become overweight and inefficient. It is time to look at the opportunities now.