LONDON –Like so many others in this fiercely independent island nation, Steve Baker, a dashing English engineer, is fed up with the long hand of the European Union in British life. The E.U., he said, has meddled for years in British legal affairs and labor laws. But now the 27-nation body had gone too far by interfering with his pride and joy: the retrofitted KTM 950 motorcycle he rides on the country lanes of Buckinghamshire.