Why does the QF1/2 A380 sit in LHR all day?

[NM]

IIRC Aircraft used - BAE 146

That certainly rings bells. I was initially thinking it might have been 737 or A320, but I think you are correct with the Flying Muffler.

 

[Catweazle]

I bet LHR would make almost as much profit from that daily as the MEL airport car park!