Love both the observation deck at LHR and LGW. LHR used to be much bigger before they closed off half the thing when they moved ELAL to Terminal 1. Also, getting up there can be a pain.

If you come from Terminal 1 or 2, there is a corridor that you can take from the departures level, this is easier, follow the signs to the Business Center as well as to the other terminal, and ahout half way you will see a stair case, take that up one floor, then follow the signs up. It has been a while since I have been to both, just too busy, unfortunately, as they are fun. LHR really should do something to make the observation terrace easier to access.

Zurich has the best, hands down. Enjoy.

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MD
AA PLT,1 MLN Miles+
Hilton Gold
Sheraton Gold