Indian Prime Minister Narendra Modi has held talks at Downing Street with his British counterpart David Cameron, at which they agreed to seize an 'historic opportunity' to work together on global issues.
David Cameron says around $15bn worth of business deals with Britain will be sealed over the course of his trip.
Prime Minister Modi's visit to the UK will also see him meet with the Queen, and attend a rally at Wembley Stadium for around 70 000 people.
His supporters hope the trip will boost his standing at home, after his party's poor showing in recent elections.
Olly Barratt reports from London.
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A guard of honour for Narendra Modi, on the first official visit to the UK by an Indian Prime Minister in nearly a decade.
For the two Prime Ministers, a chance to show they can work together.
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Downing Street is making an effort to go above and beyond the requirements for a standard bilateral visit.
"David Cameron is rolling out the red carpet for Prime Minister Modi and it follows the lavish welcome recently extended to Xi Jinping of China.
It's all part of British attempts to deepen relationships in Asia, with a particular eye on business ties."
But it's not just about Britain winning business deals - Prime Minister Modi wants to make economic gains for India too.
Jay Singh Sohal is from the Henry Jackson Society.
"He has a Digital India project which taken him all over the world, he's already met President Obama and Facebook's Mark Zuckerberg, so he'll be looking to come here, to tap into these non-resident Indian communities in Britain and try to get their talent and their skills to contribute back to his vision of improving India."
Outside Downing Street, a protest by opponents of Prime Minister Modi, and a counter protest from supporters.
But the governments of both Britain and India hope it's a trip that brings down trade barriers and sees business soar.
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