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ITV has been knocked off the FTSE 100 index, the list of the 100 biggest listed UK companies after falls in its share price.

Carphone Warehouse, Enterprise Inns and iron ore miner Ferrexpo have also lost their blue-chip status in the index's quarterly re-shuffle.

The companies have been replaced by Inmarsat, Autonomy Corporation, Stagecoach Group and silver miner Fresnillo, which only listed its shares on the London Stock Exchange in May this year.

The worsening economy has led to plunging share values for some, while bringing opportunities to others.

ITV has seen a fall in revenues as firms cut back on their advertising budgets during the credit crunch, while Enterprise Inns has reported a fall in sales as consumers choose to stay at home rather than go to the pub.

Fortunes have been mixed for mining companies, as metal prices have been volatile in the last few months.

In the last few weeks metals have been falling in price, bringing down the overall value of FTSE 100, which is heavily weighted toward mining and energy companies.

However, the soaring cost of fuel has actually helped transport firm Stagecoach, which operates trains and coaches, as consumers ditch their cars in favour of public transport.

Firms entering the FTSE 100 generally see there share prices rise on the back of the move, as a number of funds buy and track specifically the top 100 firms. Also those falling out of the FTSE 100 see the reverse.