London Heathrow (LHR): free WiFi, excellent lounges.
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Yes. Free WiFi requires a quick registration but is otherwise unlimited.
Lounge quality here is excellent. A day pass, often purchasable without status or a premium ticket, can be well worth it for a longer layover.
Extensive luxury shopping in Terminal 5, plus some of the best airline lounges in the world (British Airways Concorde Room, Virgin Clubhouse).
Yes — London Heathrow (LHR) is one of the better airports in the world to have a long layover in, with plenty to see and do.