The Office for National Statistics (ONS) revised growth for the April-to-June period up to 0.7%, up from its first estimate of 0.6%.
In light trading ahead of the bank holiday weekend, the FTSE 100 Index rose 45.2 points to 6492.1, building on a rise of nearly 1% on Thursday on upbeat economic data from China and Europe.
Progress was also being held back by ongoing concerns about the timing of the US Federal Reserve's plans to taper quantitative easing after it failed to shed any light on them in the minutes of its July meeting earlier this week.
Shavaz Dhalla, trader at Spreadex, said: "The trepidation is partly justified as officials themselves have not come to a unified agreement regarding the longevity of the stimulus measures."
In Europe, French and German bourses showed light gains while on the currency markets the pound was flat at 1.56 US dollars and 1.16 euros.
In London, big retailers were near the top of the FTSE 100 movers' board on the improving economic picture, with Marks & Spencer, up by more than 2%, or 12.3p, to 471.6p and Sainsbury's, climbing 9.9p to 398.2p.
Other supermarkets to see gains were Morrisons, up 6.6p to 292.8p, and Tesco, rising 6.7p to 372.5p.
Elsewhere, Carpetright was under pressure in the FTSE 250 Index after confirming it was one of six firms contacted by the Office of Fair Trading (OFT) as part of an investigation into misleading sale prices. The group's shares fell 5.5p to 665p as it said it was co-operating fully with the OFT and would respond to its concerns in due course.
CPP plunged another 20% -down 3p to 11.8p - after yesterday's 27% tumble as the City regulator said the group and 13 high street lenders will fork out up to £1.3 billion in compensation for mis-sold credit card and identity theft protection.
The group remained firmly in the spotlight as its majority shareholder and founder Hamish Ogston showed little remorse for the scandal.
Haulier Stobart Group was also in the red despite saying it had managed to overcome trading challenges after Britain's erratic weather triggered swings in demand from its retail customers.
The FTSE 250 group, which runs a distinctive fleet of around 2500 Eddie Stobart trucks, said it made solid progress, but shares fell nearly 4%, or 4.5p, to 112p.
The biggest risers on the FTSE 100 were Croda International, up 110p to 2677p, Marks & Spencer, Sainsbury's, and WPP, up 30p to 1221p.
The biggest fallers were Aggreko, down 48p to 1607p, easyJet, off 12p at 1265p, Eurasian Natural Resources, down 1.6p to 223.6p and Persimmon, down 7p to 1133p.