the UK 100 CFD is an index-based contract for difference, tracking the price move of a basket of 100 of the largest UK companies. It can be a more cost-efficient way of having market exposure to UK companies than trading individual shares. The UK 100 CFD is based on the London-quoted FTSE 100 Index, which is a good proxy for the broader UK market. The FTSE 100 Index tends to do well when the UK economy is growing and when consumer spending is on the rise. Live moves of the FTSE 100 can be followed in a daily price chart.