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rMagnum Power's volatile shares were one of the day's best performers, surging 15p to 141p. The Scottish inventor of power back-up systems for computers is rumoured to be close to signing supply deals with several leading computer companies. One dealer said the first would be announced soon and would be with Compaq of the US. Shares traded as high as 195p last year, and some dealers believe the price could rocket beyond 200p.

rThe arrival of Donald Trump in London sparked gossip that he was here to cast an acquisitive eye over the capital's top casinos. The main target was said to be London Clubs International. Shares finished the day 9p up at 468p. Capital Group, which runs the high-rollers' paradise, Crockfords, firmed 1p to 212p.