It strikes me that if tony had put the effort in he might have been able to help rather than just come up with negative vibes. I hate people who go around looking for reasons not to do something.
I wish I had the skills to answer, but as you've drawn a blank here try the technical help line...
Bit late to reply, but in case it helps anyone else searching. Often the reciever is too close to the electronics of the boiler and this is where the interference comes from.