Does anyone have a geographical number to report problems with Digital Radio transmissions?  A couple of weeks ago I had problems with poor sound quality on Radio 7; I checked that it wasn't the radio by a) switching between Radio 3, Radio 4 and Radio 7 and establishing that the problem occurred only with Radio 7, and b) turning on another digital radio and establishing that the same problem occurred in the same way on the second radio.  I called OFCOM and was connected to various people none of whom seemed to have the first idea about fault diagnosis. Someone from OFCOM called me back with an 0870 number (which I do not have to hand - I'm not at home at present).  The problem lasted for a couple of hours at most and hasn't recurred, so I have not bothered to call the number I was given - I'd just like to have it to hand for the future