Conspiracy Theory

I have just posted the following to a news group and will be interested to see what they say.
Would any of you know what this is?
On my computer randomly there will occur at no particular time of day what sounds like a signal.
The opening is _ .. _.. _.. then it goes into a little jumble of sounds which I am too slow to translate into dots and dashes. The whole thing lasts about 7 seconds.I thought it might be something within the house switching itself on but for the first time last week I was approximately 1 mile from the house in the car and listening to the radio when the same intereference sequence occured - exactly the same.
I think I am being bugged by Tony Blair for going to the No 10 website and making rude remarks about him so if I should suddenly - its starting againnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnnn