Ireland and the United Kingdom share a language, a land border (in the north), and a broadly similar car culture. Irish buyers watch UK car reviews, many cars are specced identically for both markets, and the second-hand trade between the two countries is enormous. Yet when you line up the registration data side by side, the two markets look remarkably different in scale, structure, and timing.
Scale: 121K vs 1.9 Million
Ireland registered 121,195 new passenger cars in 2024 (SIMI). The UK registered 1,952,778 (SMMT). That is a 16-to-1 ratio. Ireland's entire annual market is roughly what the UK sells in a busy three-week period. This scale difference matters because it shapes everything: how manufacturers allocate stock, how dealerships operate, what models get marketed, and how quickly new technologies reach buyers.
The UK market, being large enough to swing a manufacturer's European numbers, attracts aggressive pricing and marketing spend. Ireland, being a smaller right-hand-drive market that shares specifications with the UK, benefits from this but has less negotiating power.
Seasonal Patterns: January vs March
Ireland's registration spike happens in January because of its year-based plate system. The UK's equivalent spike happens in March (and to a lesser extent September) because the UK uses a plate system that changes twice yearly in those months. The effect is similar but the timing is different, which means the two markets are almost counter-cyclical. When Ireland is in its busiest month, the UK is in a relatively quiet period, and vice versa.
EV Adoption: Close but Different Drivers
Ireland's EV share in 2024 was 14.41% (SIMI). The UK's was 19.6% (SMMT). The drivers are very different. Ireland's EV adoption is incentive-led: SEAI grants, VRT relief, and motor tax advantages make EVs financially attractive. The UK's adoption is mandate-led: the Zero Emission Vehicle (ZEV) mandate requires manufacturers to sell an increasing percentage of EVs each year, with financial penalties for non-compliance. The UK approach forces supply; the Irish approach stimulates demand.
The result is that the UK has a broader range of affordable EVs available (because manufacturers need volume to meet targets), while Ireland sometimes faces supply constraints on popular models that manufacturers prioritise for larger markets.
Brand Rankings
Toyota is Ireland's best-selling brand but sits lower in the UK table. Ford, which has been fading in Ireland, remains one of the UK's larger brands, and the Ford Puma was the UK's best-selling car of 2024 with 48,340 registrations (SMMT). BMW and Mercedes have higher share in the UK, where the premium market is proportionally larger. And brands like Dacia, which have surged in Ireland, have a different positioning in the UK market where they compete in a much more crowded budget segment.
The Used Car Connection
One factor that links the two markets directly is the cross-border used car trade. When Ireland's new car market slowed during the financial crisis of 2008 to 2012, used imports became a large part of the market. This dynamic still exists, though Brexit and sterling fluctuations have changed the flow: SIMI counted 61,583 imported used cars in 2024 alongside 121,195 new registrations. The currency effect is real: when sterling weakens against the euro, UK imports become cheaper and Irish new car sales take a hit.
Compare the two markets directly on AutoNergy. Toggle between Ireland and UK in the Overview section to see the scale, timing, and fuel-mix differences side by side.
Sources: SIMI, 2 January 2025 and SMMT, 6 January 2025.