@PandaMunich Thanks for that - a very interesting thread touching on several other areas that will impact me. So for the pension fund question, if I understand correctly, I need to check the contributions amount and tax relief status, then determine the growth. If it is taxed in Germany I can get any tax deducted in the UK returned (eventually...). If not taxable in Germany then the growth amount needs to go towards progression.
BTW I am over 60 and have not made any payments into the fund for about 20 years.