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According to Reuters, the index was up 0.93 per cent to 4,439.55 points at 13:45 BST, having dipped slightly from the 1.5 per cent rise recorded at the close of the morning session.
The Royal Bank of Scotland led the market, climbing 11.78 per cent to 46.5p per share despite earlier announcing heavy losses for the first quarter of 2009.
Petrofac and Tullow Oil also rose, along with mining firms Vedanta Resources, Randgold Resources, Xstrata and Antofagasta.
British Land recorded the largest fall, sliding over eight per cent to 443.5p per share.
Equities trader Mark Priest told the news source that sentiment among investors is "on the upside".
"We've seen a pretty amazing week on the FTSE and it looks like it's set to continue," he remarked.
The index has risen by around five per cent throughout the course of the week, the news source noted.
