Rockhopper find
OIL explorer Rockhopper said it believed there was 20 per cent more oil at about 1.3 billion barrels in its discovery off the Falkland Islands.
The shares rose 21½p to 191¼p, despite it saying another of its exploratory wells had no oil.
It is drilling to find out how far the discovery extends and is planning more appraisal wells.
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