The result of the referendum in favour of the UK leaving the EU has no immediate effect on the nationality, residence and social security status of Germans and other EU citizens in the UK, as stated on the official website of the UK government.
The UK remains a full EU member with all related rights and obligations.
The UK's exit from the EU will become effective only after the negotiation of the terms of exit in accordance with Article 50 of the EU Treaty.
The EU Treaty provides for a period of two years for this, which can be extended.
It is not possible to say at this point what such an exit would then mean for EU citizens already resident in the UK, as this also depends on the outcome of the negotiations between the UK and the EU.
On this website you will also find information on the "European Passport Return Service" which can only be used when applying online. It allows applicants to request a participating local authority to photocopy their European Economic Area (EEA) or Swiss passport and send a copy to the Home Office.
Updated: April 2017