OT: New arrivals lounge in LHR T3, Priority Pass access
This may be of interest to those arriving on BA and others at LHR T3 with Priority Pass membership. I have no idea of how the facilities compare with T5 (poorly, I would think, but that's blind prejudice.

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Originally Posted by Priority Pass
Airport: London - Heathrow, Terminal 3
Lounge: Air Canada Maple Leaf lounge
Location: Landside - Arrivals Level, adjacent to the shuttle bus pick-up point at the terminal's curb side.
Opening Hours: 06:00 - 13:30 daily.