Balance transfer is a transfer of a debt from one credit card onto another. Many credit card issuers offer introductory interest rates (introductory APRs) that are much lower than the standard interest rates. Consumers may take advantage of these lower rates to transfer balances from their higher interest credit cards to the new, lower interest credit cards to save money on interest charges.

Introductory 0% Offers
A number of UK credit card companies offer new customers 0% for balance transfers for an introductory period. You could save hundreds of pounds by switching your balance to a card offering 0% APR introductory rates. 

The introductory period is usually the first six months after the card was issued although some companies are now offering intro periods of 9 months or more. Introductory APR serves as an incentive for transferring balances from existing cards onto a new card. After the introductory period the interest reverts to the standard rate.

Credit cards with the longest intro 0% APR period for balance transfers

Permanent Low Rates
If you are looking for a cheap way to pay off your balance, remember that zero rates for transfers tend to be for a fixed period.  If you think your debts will take a while to clear it might be better to choose a card which offers a permanently low balance transfer rate.

Credit cards low life time balance transfer rates