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The FTSE 100 has ended the day 22 points or 0.31% ahead at 7,183.45. 

Tesco was the biggest riser - it was up 9.8% after the announcement that it is to buy food wholesaler Booker.

Sainsbury finished down by 1.39%, making it one of the day's biggest losers.  

The biggest drop was seen by Easyjet which fell by 2.11%. The fall followed analyst comments that increasing competition in the sector could hit the airline's business. 

Today Programme
BBC Radio 4

Donald Trump apparently dislikes free trade, but he seems keen on a US and UK trade deal. How does this bode for the deal?

Randall Korzner, former governor of the US central bank, says President Trump is not anti-free trade per se.

"It's a focus on where have he and his constituents perceived job losses have come from, and I don't think they perceive job losses have come from trade with the UK," he says.

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The Unite union has announced that members working for British Airways mixed fleet cabin crew will strike for a further six days in February, "unless the airline responded to calls to resolve the dispute".

The Union has already staged five days of strike actin in the row over pay.  

The strikes will take place on 5, 6, 7, 9 10 11 February. 

Earlier in the week Unite sent an open letter to British Airways. It said: “Your reluctance to offer a reasonable pay deal to our members, yet spend what we believe is now reaching millions of pounds in trying to quash strike action, suggests money is available and this is a question of ideology. We urge you to recognise that there is a chance here for British Airways to take a different route.

"We urge you to avoid any further dispute and do the right thing for your cabin crew and our customers by engaging with mixed fleet Unite to negotiate a genuinely meaningful way forward. We would suggest that we get back around the table, with the starting point being the encouraging start that we made at Acas before Christmas.”

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Japan's All Nippon Airways (ANA) is warning US President Donald Trump's policies could be a risk for its business.

Executive president Yuji Hirako said the threat of trade wars or the knock-on impact of protectionist policies couldn't be ignored.

"We have to consider the effect on logistics and movements if trade frictions arise as in the past," he told a press conference. 

"The possibility of a slowdown in global growth is emerging. We need to spend time observing Trump's government and policies." 

The comments came as the airline - Japan's biggest - reported net profits of $752m (£600m) for 2016 - up 18% on the year before thanks to lower fuel bills, cost-cutting and a stronger yen. 

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UBS hopes a Donald Trump-inspired rally in the United States will help boost earnings at its struggling wealth management business after reporting a 47% fall in full-year net profit.

"Although macroeconomic uncertainty, geopolitical tensions and divisive politics continue to affect client sentiment and transaction volumes, we have begun to observe improved investor confidence, primarily in the US, which may benefit our wealth management businesses," Switzerland's biggest bank and the world's biggest wealth manager said.

UBS saw its 2016 net profit fall to 3.3 billion Swiss francs (£2.6bn) from 6.2 billion in 2015.

Today Programme
BBC Radio 4

The majority of the UK economy is services, and 80% of our exports are services, says Shanker Singham of Legatum Institute.

"What we very much need from any deal around the world, particularly with developed markets like US, is services access - financial services, insurance services... These are difficult to do with the US."

The White House has proposed a 20% "border tax" on Mexico as one of the ways to recoup the costs of building a US-Mexico border wall.

The wall is a campaign promise that is wildly popular among President Trump's supporters, but news of the tax sparked anxiety among some for the price of avocados and tacos.

The World at One
BBC Radio 4

The UK's biggest supermarket group Tesco has agreed to buy UK’s biggest food wholesaler Booker Group in a £3.7bn deal.

Lord Haskins, who was the Chair of Northern Foods and is now a crossbench peer, tells The World at One that  it is an ironic turn of events as "the big out of town stores destroyed these small convenience in town stores thirty years ago" and now Tesco is buying into them.

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There was little change at the start of Friday's trading on Wall Street. 

The Dow Jones remained above the 20,000 it hit for the first time earlier this week at 20,108.13, a rise of 7 points or 0.04%.

The S&P 500 was at 2,295.09, a fall of 2 points or 0.07%.

And the tech-heavy Nasdaq was at 5,653.31, a fall of 2 points or 0.03% - that's despite the fact it was tipped to open higher following a raft of positive tech company results. 

TechTent is on BBC World Service at 15:00 GMT 

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The European Commission has placed anti-dumping duties on two steel products from China and Taiwan - "stainless steel tube and pipe butt-welding fittings".

The products are used to join pipes in industries including petro-chemical, food processing, shipbuilding, energy generation and construction.

Chinese exports will be taxed between 30.7% and 64.9%.

Taiwanese exports face anti-dumping duties ranging from 5.1% to 12.1%.

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The number of North American tourists visiting the UK shot up 11% in the three months to November, according official estimates.

The Office for National Statistics (ONS) said, external visits from EU residents increased by 5% over the same period, but tourists from other countries fell by 9%.

The ONS didn't say whether the fall in the value of sterling - which has dropped about 16% since the Brexit vote - was a factor.

The US economy lost momentum in the final three months of 2016.

The Commerce Department said the US gross domestic product grew at an annual rate of just 1.9% in the October-December period, a slowdown from 3.5% growth in the third quarter.

GDP, the broadest measure of economic health, was held back by a jump in the trade deficit.

The world's largest economy grew 1., external9% in the fourth quarter, below forecasts of 2.2%.  

Dan Thomas
Business reporter

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Tesco took the retail world by surprise when it announced it was buying Britain's largest food wholesaler, Booker Group, in a £3.7bn deal.

But what exactly does Booker do and why has the country's largest supermarket snapped it up?

Booker may not be a household name but you may well have eaten in one of the restaurants it supplies or shopped at its stores.

Its sprawling empire includes the UK's largest cash and carry business and a raft of well known convenience brands including Londis and Budgens.

Read more here.