The A1 is the longest numbered road in the UK, at . It connects London, the capital of England and the United Kingdom, with Edinburgh, the capital of Scotland. It passes through and near North London, Hatfield, Welwyn Garden City, Stevenage, Baldock, Letchworth Garden City, Huntingdon, Peterborough, Grantham, Newark-on-Trent, Retford, Doncaster, Leeds, Harrogate, York, Ripon, Darlington, Durham, Gateshead, Newcastle upon Tyne, and Berwick-upon-Tweed.