BERLIN, March 8 (Reuters) - Germany is considering banning certain components from Chinese companies Huawei and ZTE in its telecoms networks, a government source said, in a potentially significant move to address security concerns. "The devil is in the details, it would be a major step forward if this included all access network components where operators have made excessive use of Huawei in recent years," said Thorsten Benner, China expert and director of the Global Public Policy Institute in Berlin. Britain, meanwhile, wants telecom firms to remove equipment and services from Huawei in core network functions by Dec