Just another note on the above, I had got back indoors to the phone ringing with a withheld number, I have caller ID. but because of recent events I thought I had better answer. It was a company offering me loft & house insulation & wanted to know if I had got my goverment grant through. That caller got a very short polite NO to both questions. We have the special number block in place but the firms are getting round it by using the withheld option.   I think this is all wrong as some people get easily confused & then end up with things they don't need or paying over the odds for them.