I think I paid about £25 for that particular item from Argos about 6 months ago.:-(
My original comp had a spike via the modem and blew 2 hard drives, graphics card and of course the modem. I of course had no surge protector.:-(
I ordered my replacement bits, via the internet and of course forgot to order a surge protector. There was no way I was going to boot this one up without one, so the quickest, easiest and now looks like the most expensive was to buy from Argos.
Never mind at least I know I am protected now.
It can be an expensive buisiness with out one. :-)