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How can I improve my credit score if I am not paying bills or rent?
One of the other things you could do to improve your score would be along the lines of what Pete said in his answer, but using the current financial climate to your advantage. I'm not sure what interest rates are available to you in the UK, but I currently have 4 lines of credit aside from my house. One is a credit card I use for every day purchases and like you pay off immediately with every statement. The other three are technically credit cards, however all three were used to make purchases with 0% financing. The one was for a TV I bought that even gave me 5% off if I pay it off within 6 months. That cash has been sitting in my savings since the day I bought it. I'm making regular payments on all three, but not having to pay any interest. My credit score dropped 25 points with the one as it was an elective medical expense (Visian eye surgery), so for the time the balance is near my credit limit. However, that will bounce back up as the balance lowers. My score was also able to take that hit and still be very high. If you don't have 0% (or very close) available, your better bet would be to follow the other suggestions about saving for a sizable down payment, or other every day expenses like a cell phone.