the problem might not be as easy as pulling extension from the other point. A 13A power point can supply up to 3000W. Or rather a fuse in your ELCB can take up to 3000W. If your other powerpoint also sharing the fuse then there is no point if you pull an extention point cause it is from the same fuse. You can test by plugging something in and turn off each of the fuse and see if both the power point turn of at the same time.

Calculate the loading that you are putting on the fuse. A 42 inch plasma is about 300-350W already. Your HTS might take a lot more.

Be careful, else you can fry everything connected or cause a fire...