What an appalling use of English sanjampet. My question was perfectly clear.
Should anyone else have similar issues I am posting the solution myself (thanks to Yahoo answers for this).
It turns out that the generic power supply I was using for the MBP was generating RF interference. This is what was cutting out the MUX 2 reception on the freeview box.
I replaced the power supply with a genuine Apple power supply and all is now well - so, all my fault for using a generic power supply...