Any Computer PSU sold in UK will be 230V/240V. 150W is a very low figure. You should invest in a power supply with the rating of at least 250W/300W depending upon your computer's configuration. The important factors to consider are:
2.Number of Hard Drives installed;
3.Number of optical drives installed (CDROM etc);
4.Type of graphic card.
I hope no other component in the computer has been damaged due to the demise of PSU.