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From Cardiff, you can reach all of South Wales and North Wales directly (absurdly, however, to get to Mid-Wales you have to go via Swansea or Shrewsbury), Southwest England, Oxfordshire, Berkshire, Hampshire, Sussex, London, most of the West Midlands, Derbyshire, Nottinghamshire, Cheshire and Greater Manchester.
From Edinburgh, you can reach most of Scotland directly as far north as Aberdeen and Inverness, Northeast England, most of Yorkshire, much of Northwest England, parts of the West Midlands, Derbyshire, Nottinghamshire, Lincolnshire, Cambridgeshire, Buckinghamshire, Hertfordshire, London and most of Southwest England.
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