On the radio.. FM and AM but not all the time. Its every few seconds. I have wandered around with a portable and unplugged everything like chargers etc, and I have no boiler or gass appliences, as it sounds like a spark of an igniter or similar.
Would this be a likely cause, ie a dodgy boiler in a neighbours house that does not ignite for a while then does and the ticking stops? I have got to find it, and I'm now certain its not in my house.
Brian