Germany and the UK enjoy a cordial relationship, but this doesn't mean that they don't have rules that govern their citizens' interactions. A major distinction is that Germany does not require visas for British nationals, but the UK does. The visa restrictions were set to prevent fraud and system abuse.
Those partners or children (under eighteen) of EU/EEA nationals may apply for a family reunion visa, a German national long-stay visa. With the family reunion visa, you can move in with a relative who is a citizen of the EU or the European Economic Area and receive permanent residency and status there.
In Germany, marriage are considered legal unions, and essentially legally binding contracts between 2 persons. The union is protected under the German Constitution. Persons getting married in Germany only need to appear physically at a Standesamt for a civil ceremony. Witnesses are not required in this case and a religious ceremony is optional.
Whether you are looking to spend a couple of months in Germany, perhaps for a work-related seminar, or to stay with relatives, or book an InterRail trip for example, then the simplest, most hassle-free method of traveling there, and then to virtually all the western European countries, is with a Schengen visa Germany.
Germany's central position in Europe means that it has become a hub for international airport transfers. While most travellers will not require a visa for transitional visits, some nationals will, namely:Afghanistan, Bangladesh, Eritrea, Ethiopia, Ghana, India, Iran, Iraq, Jordan, Lebanon, Mali, Nigeria, Pakistan, Somalia, South Sudan, Sri-Lanka, Sudan, Syria, Turkey.