Lufthansa Business Lounge T2, Heathrow

Star Alliance Silver on Lufthansa Group flights. Buffet and bar, no showers. Adequate; always use the Senator Lounge if you have access.
Lufthansa Senator Lounge T2, Heathrow

Star Alliance Gold on Lufthansa Group flights. Buffet, staffed bar, complimentary showers. Reliable and well-maintained; above the generic alliance standard.
United Polaris Lounge T2, Heathrow

Polaris ticket or Premier 1K only. À la carte, full bar, complimentary showers. United’s best lounge outside North America.
SilverKris Business Class Lounge, T2 Heathrow

Star Alliance Gold on any Star Alliance carrier. Buffet, staffed bar, complimentary showers. Best Star Alliance business lounge at T2 when open.
Singapore Airlines SilverKris First Lounge T2, Heathrow

SQ First ticket or PPS Club only. À la carte, complimentary showers. The best lounge at Heathrow. Open around SQ departures only.
American Airlines First Class Lounge — T3, Heathrow

oneworld Emerald access. À la carte dining, complimentary showers, no spa. Well-finished and professional; no entry for Star Gold alone.