Stoozing
Have you ever heard of the term 'stoozing'? According to the wikipedia, stoozing is the act of borrowing money at 0% , earning interest from the money and paying it back before the 0% earns. Essentially, it is free money for you! It will only work for you if you can good in your paperwork. Another method is to use credit cards with cash back so that you will get rebate for your purchase.
This website introduces credit card offers from the UK. Currently, Sony credit card offers 0% balance transfers for 12 months and 0% on purchases for 3 months(i.e no interest). In addition, 3000 Sony rewards is given when the card is first used.
Certain cards such as Citi Platinium and Nat West promise free balance transfer for a certain number of months. This is good for stoozing since one can simply transfer the credit into another high yielding investment and "replace" the money in time. Go to The personal loans section for more information. Alternatively, do feel free to visit their Cheap loans section for other offers.