 He also campaigned for better air and sea links with Scandinavia.Davidson was Liberal spokesman on foreign affairs and defence issues in Parliament, a particularly important brief given the ongoing war in Vietnam and the arguments over Britain's role East of Suez.In February 1967, he took a leading role in the opposition to the government's plans to raise fees for foreign students at British universities and introduced a Bill to give the people of Scotland and Wales referendums on devolution.