In reply to:
They're certainly supposed to be filtered, but the Solwise one is a bit cheap and nasty.
Oh. I obviously made a mistake, and should have bought the ADSLNation one three or four years ago. Aren't I lucky that I have had no problems whatsoever in that time with this obviously completely inadequate piece of kit. I obviously should have spent the extra 5p rather than buy this cheap and nasty thing. (Of course there was a problem in that the the ADSLNation equivalent wasn't available then, so I suppose I should have done without until it arrived since it obviously shouldn't have worked as well as it did).
And if you haven't noticed, some of this is a joke. Some is also a criticism. Please try and work out which is which before you complain. I do happen to have used both items and neither I nor the other three installations I have made using it have had a problem with the Solwise faceplate. The only reason I prefer to use the ADSLNation offering is because it allows the unfiltered extension which would have been extremely useful on one of my installations, but they were unable to supply it. (Or if they were they couldn't be bothered to tell me which would not have been difficult since I was looking precisely for a faceplate with an unfiltered output).
I placed an order with ADSLNation today for a client's installation. The faceplate was the only thing they could provide from my list, the rest came from Solwise and would have included their faceplate except that this installation needs an unfiltered extension.