Well, I use a
much cheaper one than that, Clive, £20 from Argos, I think! It has a light on it to show the Surge Protection is supposed to be working, but how does one know for sure, until something happens to test it?
I have heard that the cheaper ones are only good for one 'hit', then you have to replace them, as they are not so effective. Of course, it doesn't tell you that on the box!