The RCD in the consumer unit will provide basic protection, but I would recommend a separate anti-spike surge protector for your computer equipment. The reason for this is that RCDs are designed to trip in the event of electrical faults such as shorts or earth leakage and will not necessarily trip if there is a mains surge.
You can usually get one which will protect your incoming phone circuit as well.
RCD stands for Residual Current Detection and checks to make sure that any current flowing in the earth circuit is less than a safe limit. It has no surge protection capability as far as your PC or TV is concerned. As amonra says you would be well advised to buy a good power strip that is fitted with surge protectors for mains power, the telephone line (to protect your internet connection) and some even have surge protection for the TV aerial.