Hello, I am Keith, one of the experts om Just Answer, and pleased to be able to help you with your question.
Your pension from Germany is taxable in the UK. If you spend more than 183 days in the UK in any one tax year you are liable to UK taxation on your world wide income. Any tax deducted by Germany is, under the Double Taxation Convention between the UK and Germany which precludes the same income stream being taxed in both jurisdictions, allowed as a tax credit against any UK liability. You must self assess for UK taxation every year unless HMRC tell you to the contrary as even HMRC do not want to process tax returns which yield no revenue.
I do hope that you have found my reply of assistance.
I am sorry Paula, but I simply do not understand why this has to be explained to the government. The income is simply declared on the annual self assessment tax return and that is all there is to it. No other explanation is needed.
Thank you for your support.