使えます

Lounge Access Policy
International Business Class Customers
As an International Business Class Customer you have access to any Star Alliance member carrier’s owned Business Class lounge at the airport where your flight departs, if the following conditions are met:
You present a boarding pass in International Business Class on a Star Alliance member airline operated flight
Your flight departs on the same day of your visit or latest by 05:00 AM the next morning
The lounge shows the Star Alliance Gold logo at the entrance
You are not entitled to bring any guests.

Regional Sites
UK
Lounge Finder
Air Canada Maple Leaf Lounge
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Plaza Premium Lounge

ただし、LHのは、
Lufthansa/Star Alliance Business Class ticket
Lufthansa Business Lounge
Boarding pass for a Lufthansa/Star Alliance flight departing on the same day
Lufthansa Senator Lounge
No admission
なので、ご注意を。