I forhold til Fast Track har jeg netop fået svar på dette på Diamond mailen - jeg havde en kollega med hjem fra London som ingen status har hos SAS, men på SAS Go. Fast Track og lounge for begge uden problemer.
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Dear Lars
Thank you for getting in touch with us.
You can bring 1 friend or 4 family members in Star Alliance fast track if you are flying with a SAS operated flight no matter the airport.
So lets say you was on a Lufthansa flight from LHR you could only use it yourself.
If you are flying with a Star Alliance airline within Scandinavia then you can still bring 1 friend or 4 family members.
Have a nice day!"