UK and German trade bodies have urged that shared economic interests must be a priority in the Brexit negotiations.
The British Chambers of Commerce and the Association of German Chambers of Commerce said uncertainty over "business critical" issues such as workers' rights, tax and customs arrangements need to be tackled.
The German Chamber said the uncertainty was affecting German firms which traded with the UK.
Most members of the British Chamber say they want "at least" a three-year transition period.
The groups called for political leaders to "build an atmosphere of mutual trust and constructive dialogue", to deliver clarity and certainty for businesses.