Britain's small cap equity indexes rise to slightly outpace gains on the blue-chip index.
The FTSE Small Caps Index and junior-listed FTSE AIM All Share Index are both up by 0.2 percent in mid-session trade, with the blue-chip FTSE 100 index up by 0.1 percent.
The FTSE 250 Mid Caps Index, which hit a fresh record high earlier in the week, is down by 0.3 percent.
Antrim Energy surges 24 percent after the company says oil production has resumed at the Cormorant East Field after maintenance work.
Renewable energy company Acta SpA edges up by 1.6 percent after raising a gross amount of 2.1 million pounds ($3.39 million) from a share placement.
"This is encouraging news," writes Cantor Fitzgerald analyst Caroline de La Sougeole, who keeps a "buy" rating on the stock.
Sports marketing group Chime Communications falls 1.9 percent after buying Just Marketing Inc (JMI) for $71 million in a deal that costs it the support of its largest shareholder WPP.
($1 = 0.6186 British pounds)
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