POKER firm PartyGaming was today valued at £4.64bn in the biggest flotation in London since the dotcom boom.

The company, which owns online brand PartyPoker, is worth more than British Airways and retailer Boots after investors agreed to buy 20.6 per cent of its shares at a price of 116p. Shares in the firm shot up to 127p after conditional dealings began at 8am. The flotation price was within the range of 111p to 127p indicated by the Gibraltar-based firm a fortnight ago but was more cautious than many in the City had been expecting. Full trading is due to start on Thursday and the valuation of PartyGaming means it is almost certain to be admitted to the FTSE 100 Index in its autumn reshuffle.