United Kingdom

By the end of this century, the United Kingdom's tourism industry will be at once unrecognisable and stubbornly familiar. Castles, gardens, moors, theatres and low-ceilinged pubs will still anchor the country's offer to the world, but the climatic and technological substrate beneath them will have been remade. Under a central scenario consistent with the Met Office's UKCP18 projections — roughly two-and-a-half to four-and-a-half degrees of warming above the late-twentieth-century baseline — southern England will have acquired a recognisably Mediterranean cast, Scottish winter sports will be functionally extinct, parts of the East Anglian and Norfolk coasts will have been ceded to the sea, and the Thames will flow past Westminster only because a successor to the current Barrier has been built to hold it back. The country that emerges is, paradoxically, both more attractive and more contested than the one travellers know today.

The climatic transformation is uneven. Scotland warms more slowly than England and continues to receive substantial rainfall, particularly in the west; Wales experiences sharper precipitation contrasts; Northern Ireland sits between the two; and southern England sees by far the most dramatic shift, its climate envelope sliding south toward something closer to today's western France or northern Spain. Summers as hot as the 40.3°C reached at Coningsby in July 2022 become typical by mid-century, while winters grow milder and wetter, with hourly rainfall extremes intensifying even as overall summer totals fall by up to nearly half in the driest southern catchments. The combination of drier soils and flashier downpours is the worst possible mix for both heritage masonry and for the chalk streams of the Cotswolds, the Test and the Itchen that quietly underpin so much rural tourism.

The coastline pays the steepest visible price. Norfolk's soft cliffs at Happisburgh and Hemsby, already among the fastest-eroding in Europe, retreat further as sea level rises by something close to a metre in the worst-exposed south-eastern locations. The Environment Agency's Coastwise programme — the first formal acknowledgement that holding the line everywhere is unaffordable — accelerates a managed retreat that by 2100 has surrendered substantial sections of the East Anglian coast. The Norfolk Broads progressively salinise. Along the southern seaboard, sea-level rise and cliff erosion threaten Birling Gap, parts of Praa Sands and stretches of the South West Coast Path. Yet, paradoxically, the seaside-resort economy of Brighton, Blackpool and Bournemouth grows stronger in real terms: warmer, longer beach seasons coincide with Mediterranean competitors slipping past the threshold of summer comfort, and the resorts that invest in adaptation thrive.

London faces two diverging pressures — heat and water. Forty-degree days become routine, exposing the Underground, historic buildings without cooling, and a hospitality estate built for a cooler climate. The Thames Estuary 2100 plan, widely regarded as the gold standard for adaptive coastal planning, anticipates a successor structure to the current Barrier operational well before century's end, alongside raised walls protecting hundreds of billions of pounds of property and over a million residents. The economic case for protection is overwhelming, and the works will be done. Further north, the Highlands acquire a longer warm season but lose iconic species and pastimes: grouse moors decline as heather fails, salmon-fishing collapses on lower river reaches, and commercial skiing at Cairngorm, Glenshee, The Lecht, Glencoe and Nevis Range becomes overwhelmingly unviable. Aviemore pivots fully to year-round nature-based tourism — mountain biking, dark-sky and aurora trips that remain credible at 57°N, and rewilding safaris through landscapes increasingly defined by ecological restoration rather than agricultural use.

Rewilding becomes a distinct and recognisable tourism category. Knepp in West Sussex popularised the process-led model with safaris, glamping and an agritourism business that pays for itself; Cairngorms Connect, covering more than 60,000 hectares, anchors a network that by century's end includes Alladale, Ennerdale, Wild East and the Weald-to-Waves corridor. White-tailed eagles, beavers, pine martens and — within a generation — most likely lynx populate landscapes that visitors increasingly pay to walk through under ticketed access. The National Trust's botanical portfolio Mediterraneanises in parallel, with drought-tolerant species displacing the yew and lawn of Capability Brown's eighteenth-century landscape parks, which were designed for a wetter, cooler world.

The way visitors arrive is transformed by a quiet revolution on the rails. Eurostar's fleet renewal, the opening of Channel Tunnel paths to new entrants, and the revival of overnight rail through European Sleeper and similar networks together make direct rail the majority mode of UK–European tourism for journeys under roughly twelve hundred kilometres. London is linked nightly to Berlin, Vienna, Milan, Madrid and Edinburgh. Aviation decarbonises only partially: a Sustainable Aviation Fuel mandate that began at two per cent in 2025 climbs to twenty-two per cent by 2040, and by 2100 perhaps half of UK departure energy comes from non-fossil sources, with the remainder priced through the UK Emissions Trading Scheme. Flying becomes markedly more expensive in real terms, long-haul inbound shrinks and skews wealthier, and the European short-break market, conducted increasingly by train, dominates volume.

Artificial intelligence reshapes the visitor experience at every touchpoint, with effects that cut both ways. On the positive side, destination-management platforms smooth flows across Skye, the Lake District and Edinburgh's Royal Mile through dynamic capacity pricing and real-time route nudging; hyper-personalised itineraries push travellers toward under-loved regional destinations and partially solve the spatial concentration that today sees the majority of inbound spend stay in London. Digital twins of cathedrals, castles and Roman sites enable predictive conservation, while virtual and augmented overlays at the most fragile heritage — Stonehenge, the Tower of London, the Standing Stones of Stenness — offer paying alternatives that cap physical footfall. The counterweight is substantial. The electricity demand of AI infrastructure itself is projected to rise from a handful of terawatt-hours in 2023 to many tens of terawatt-hours by mid-century, concentrated in clusters around Slough, west London, Manchester, Hertfordshire and North Lincolnshire that strain local water utilities. If the grid does not decarbonise faster than data-centre demand grows, AI's incremental emissions threaten to undermine the credibility of net zero altogether. Hospitality labour is displaced; algorithmic gatekeeping risks entrenching inequality of access; and authenticity — the human greeting in a Soho restaurant or a Hebridean B&B — becomes a premium product.

Underpinning all of this is a transformed system of governance. A statutory visitor-levy architecture, absent until very recently, becomes embedded across every devolved nation. Edinburgh's five per cent levy goes live in July 2026, Glasgow follows in early 2027, Welsh councils acquire the power to charge from April 2027, and English mayoral authorities — London and Manchester first — exercise the same powers within the same window. By century's end, every meaningful UK destination charges a visitor levy, with revenue ring-fenced for heritage, climate adaptation, affordable housing and active travel. The result is a quieter and more durable revolution than any single climate policy: tourism's wealth is systematically redirected toward the communities and landscapes that produce it.

The country that hosts visitors in 2100, then, is hotter in the south, depopulating its most vulnerable coasts, rail-connected to Europe, mediated by AI at every visitor touchpoint, and shaped at the landscape scale by rewilding rather than agriculture. Inbound numbers plausibly reach sixty to ninety million annually, against the record forty-three to forty-four million of 2025, supported by an older and larger domestic market and by the UK's quiet repositioning as a temperate refuge from Mediterranean overheating. Tourism will not be simpler — the politics of access, the energy footprint of the technology that enables it, and the unfinished work of decarbonising aviation guarantee that. But on balance, the British holiday of 2100 will be more sustainable, more equitably shared, and — against the odds of a destabilising century — more sought-after than the one we know.