LONDON/NEW DELHI (Reuters) -Britain and India will sign a landmark free trade agreement on Thursday during a visit by Indian Prime Minister Narendra Modi, sealing a deal to cut tariffs on goods from textiles to whisky and cars and allow more market access for businesses.

The two countries concluded talks on the long-coveted free trade pact in May after three years of stop-start negotiations, with both sides hastening efforts to clinch a deal in the shadow of tariff turmoil sparked by U.S. President Donald Trump.

The agreement between the world’s fifth and sixth largest economies aims to increase bilateral trade by a further 25.5 billion pounds ($34 billion) by 2040. It will take effect after the British parliament and India’s federal cabinet approve it, likely within a year.

“Our landmark trade deal with India is a major win for Britain. It will create thousands of British jobs across the UK, unlock new opportunities for businesses and drive growth,” British Prime Minister Keir Starmer said.

The agreement will be signed during Modi’s fourth visit to the UK since he took office in 2014. The leaders will also sign a strategic partnership covering areas such as defence and climate, and strengthen co-operation on tackling crime.

Under the trade agreement, tariffs on Scotch whisky will drop to 75% from 150% immediately, and then slide to 40% over the next decade, according to the British government. On cars, India will cut duties to 10% from over 100% under a quota system that will be gradually liberalised.

In return, Indian manufacturers are expected to gain access to the UK market for electric and hybrid vehicles, also under a quota system, Indian commerce ministry officials said.

The ministry has said 99% of Indian exports to Britain would benefit from zero duties under the deal, including textiles, while Britain will see reductions on 90% of its tariff lines.

The agreement represents Britain’s most significant trade deal since it left the EU in 2020, though the projected boost to British economic output, of 4.8 billion pounds a year by 2040, is small compared to the country’s gross domestic product of 2.6 trillion pounds in 2024.

The deal will also facilitate easier access for temporary business visitors, though visas are not covered. Britain and India also agreed to ensure workers no longer have to make social security contributions in both India and Britain during temporary postings in the other country.

Under the trade deal, British firms will be able to access India’s procurement market for projects in sectors such as clean energy, and it also covers services sectors such as insurance.

India didn’t succeed in its efforts to get an exemption from Britain’s Carbon Border Adjustment Mechanism (CBAM) – which could levy higher taxes on polluters from 2027 – as part of the deal.

The two sides also haven’t concluded talks over a separate bilateral investment treaty, which were held in parallel to trade negotiations but still continue.

(Reporting by Alistair Smout in London and Manoj Kumar in New Delhi; editing by Philippa Fletcher)