I want to use miles to upgrade to Business from Dubai to London (either Gatwick or Heathrow, preferably LHR) in the first/second week of June.

I still haven't booked flights... are there certain flights on the DXB-LON sector that are easier to upgrade using miles than ? I've heard doing this on the 0745 EK1 Heathrow run is nearly impossible nowadays...how about the 8am flight to Gatwick, or others?

I'd love to get on the A380, or if not, then the B777-300ERs with the latest Business class product.

Thanks