Britain and Ireland

Great Britain and Ireland sit on the continental shelf of Europe, cut off by rising seas at the end of the last Ice Age. Britain was still joined to the continent across what is now the southern North Sea until roughly 6500 BC; Ireland became an island earlier, which is one reason it has fewer native mammals and, famously, no native snakes.

The Gulf Stream and the prevailing westerly winds give both islands a mild, wet, changeable climate. Palm trees grow on sheltered coasts in Kerry and Cornwall while the Scottish mountains keep snow into spring. Rain falls mostly on the west: the Lake District, Snowdonia, the western Highlands and the whole Atlantic coast of Ireland catch far more than London or Dublin.

Geology draws a rough line across Britain from the Tees to the Exe. North and west of it lie old hard rocks, uplands, moors and lochs; south and east lie softer chalk and clay, rolling farmland and most of the population. Ireland is shaped like a saucer: a flat, boggy, green centre ringed by coastal mountains, with the dramatic scenery almost all on the rim.

Both islands are among the most deforested parts of Europe. Much of what looks like wild land, from Highland glens to Connemara bog, was shaped by grazing, clearance and peat cutting. Rewilding projects and new national parks are a live debate, and a reason trails and landscapes look different from one visit to the next.

The two islands share prehistoric monuments older than the pyramids, Newgrange in the Boyne valley and Stonehenge on Salisbury Plain, and a Celtic-speaking Iron Age. Rome conquered most of Britain from AD 43 but never Ireland. After Rome left, Irish monks carried Christianity and learning to Scotland and northern England, while Anglo-Saxon kingdoms formed in what became England.

Anglo-Norman lords arrived in Ireland in 1169 and the English Crown claimed lordship over the island from 1171. Control was weak for centuries outside Dublin and the Pale. Tudor and Stuart monarchs broke Irish lordships by force, and after 1609 the Plantation of Ulster settled Protestant English and Scottish colonists on confiscated land in the north — the root of today's divide.

England absorbed Wales by law in the 1530s and 1540s, shared a king with Scotland from 1603, and formed the Kingdom of Great Britain with Scotland in 1707. Ireland was joined in 1801 to form the United Kingdom of Great Britain and Ireland. The Great Famine of 1845–1852, when potato blight struck and about a million people died and another million emigrated, hardened Irish opinion against rule from London.

After the 1916 Easter Rising and the War of Independence of 1919–21, the Anglo-Irish Treaty created the Irish Free State in 1922, while six north-eastern counties stayed in the UK as Northern Ireland. The Free State became a republic in 1949 and left the Commonwealth. Both countries joined the European Economic Community together in 1973; only the UK left the EU, in 2020.

Northern Ireland was built with a Protestant, unionist majority that wanted to stay British and a Catholic, nationalist minority that largely wanted a united Ireland. Discrimination in jobs, housing and voting led to a civil rights movement in the late 1960s and then to three decades of conflict known as the Troubles, in which about 3,500 people were killed.

The 1998 Good Friday (Belfast) Agreement set up power-sharing between the two communities, recognised the right of people in Northern Ireland to be British, Irish or both, and allowed a future referendum on Irish unity. Army checkpoints and watchtowers on the border came down; today roads cross it without any sign beyond a change in speed-limit units and road markings.

Brexit made the border a problem again, because the UK left the EU's single market and customs union while Ireland stayed in. The Northern Ireland Protocol, revised as the Windsor Framework in 2023, moved goods checks to the Irish Sea instead of the land border. For travellers, nothing changed at the land border itself.

What the traveller notices is the Common Travel Area, an arrangement older than both countries' EU membership. It lets British and Irish citizens move, live and work freely on both islands. Visitors of other nationalities are not part of it: they must meet Irish rules in the Republic and UK rules, including the ETA, in Northern Ireland, even though no one checks the train from Dublin to Belfast.

English is the everyday language almost everywhere, but it is not the only one. Welsh is spoken by close to a fifth of people in Wales and is the first language across much of the north-west; road signs, stations and official forms are bilingual. Scottish Gaelic survives in the Outer Hebrides and parts of Skye, and Scots, the Germanic language of Burns, is spoken in some form by over a million people in Lowland Scotland.

Irish (Gaeilge) is the first official language of Ireland. Most people learn it at school but few use it daily; the Gaeltacht areas of Connemara, Donegal, Kerry and a few other places keep it as a community language. Signs are bilingual, and you will meet Irish words in public life: Taoiseach for prime minister, Dáil for parliament, Garda for police.

Identity follows the nations more than the states. Many Scots and Welsh put their nation before 'British'; people in Northern Ireland may call themselves British, Irish, Northern Irish or several at once. Scotland has its own legal and school systems and banknotes; Wales and Scotland have their own parliaments with powers over health, transport and tourism taxes.

The shared language hides real differences in vocabulary and habit. A 'lift' may be a ride in Ireland and an elevator in England, a 'press' is a cupboard in Ireland, and 'grand' means fine. Pub culture, sport and music differ too: Gaelic football and hurling in Ireland, rugby in Wales, football everywhere.

Since Brexit the two countries have drifted apart on entry rules. The UK built a digital border: almost every visitor who does not need a visa, EU citizens included, now needs an Electronic Travel Authorisation, and airlines, ferry lines and Eurostar refuse boarding without one. Ireland stayed with the EU's free movement for EU citizens but kept out of Schengen, so it has no ETA, no ETIAS and no EES.

The Irish Sea is crossed mostly by air. Dublin–London is one of the busiest air routes in Europe, and short flights link Dublin, Belfast, Cork and Shannon to a dozen British airports. Ferries remain the way to bring a car or to travel slowly: Holyhead–Dublin, Cairnryan–Belfast and Fishguard–Rosslare are the main lines, and 'Sail Rail' tickets combine train and ferry from London.

Money and phones split along the same line. The Republic uses the euro and EU mobile roaming rules; Northern Ireland and Britain use sterling, and EU roaming protections no longer cover the UK, though many operators still include it. A card without foreign fees and an eSIM that covers both countries avoid most surprises.

For a first trip the practical answer is usually one island. London, Edinburgh and York fit one rail spine; Dublin and the west fit a car. The Belfast–Dublin train is the easiest way to see both states in one trip, and Eurostar makes Paris or Brussels a simpler add-on to London than much of rural Britain.