United Kingdom itineraries: 1 week, 2 weeks and 3 weeks

Pick the route by length first, then adjust nights. The table below is the version that wastes the least time in transit; every leg is a direct train unless noted.

Start with London because flights are cheapest and most frequent there, and because the first two days are usually lost to jet lag and admin. Four nights gives you three full days: one for Westminster and the Tower, one for a free museum and the South Bank, one for a day trip. Book timed tickets for the Tower of London and Westminster Abbey before you fly; the Abbey closes to tourists on Sundays except for services.

Then move north by train rather than doubling back. The East Coast Main Line runs London to York in about 1 h 50 and on to Edinburgh in about 4 h 20 (check). Advance tickets bought weeks ahead cost a fraction of the walk-up fare, so fix your dates early and book each leg as a separate ticket if that is cheaper.

In Edinburgh, three nights covers the castle, the Old Town and the New Town, plus one day out. Highland day tours leave from the city and are the simplest way to see mountains and lochs without driving. In August the city fills for the festivals; book accommodation months ahead or shift your dates.

With two weeks, insert Bath between London and York for the Roman baths and Georgian streets, and use it as a base for Stonehenge or the Cotswolds. Bath to York is roughly 4 h by train via Bristol or Birmingham (check), so treat it as a travel morning rather than a sightseeing day.

With three weeks, add one region rather than three. The Highlands and Skye need a car or a small-group tour and 3–5 nights. The Lake District works from Manchester or by train to Windermere, 2–3 nights. Cornwall is the longest haul by rail and rewards 3–4 nights. Wales, based on Cardiff or Snowdonia, is the easiest add-on from the London–Bath corridor.

The same route feels different by month. Daylight, crowds and price move more than the weather does.

Rail is the biggest variable. Advance single tickets on the London–Edinburgh run can be a small fraction of the flexible fare, so the same route can cost very different amounts depending on how early you book (2026 estimate). Accommodation is the second lever: London in particular swings widely by date and area.

A rough shape for one person per day, excluding flights: budget hostel or budget chain room, supermarket and casual meals, and public transport. Add for car hire, tours and any island ferries on the longer routes.

Do not try to see England, Scotland, Wales and Northern Ireland in one week. The distances are short on a map and slow in practice once you leave the main rail lines.

Trains are the default between London, York, Edinburgh, Bath, Oxford, Cambridge, Manchester, Liverpool, Cardiff and Glasgow. A car helps in the Highlands, the Lake District, Cornwall and rural Wales, and is a liability in central London and Edinburgh.

Check rail engineering works before you book: weekend closures on a route can add a bus leg and an hour. Also check whether your dates fall in a school holiday, which shifts prices more than the season does.