Mine does the same, my pipes also do it , I thought it was mice or next door or something I got really nervous too. Sometimes it does it when its cold just because it's chilly and the pipes make noises when being heated.
Usually draining the system can make the heat go through again, but its an annoying job. Are you in a rented house, you could see if the landlord will have a little look
Orginally I read this as radiating vibrator :S
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