The 'exclusive' access to premium is governed by this rule
Available exclusively for Finnair Plus Platinum and Gold members (+ one guest), and oneworld Emerald and Sapphire cardholders (+ one guest), when the departure flight is marketed by a oneworld airline.
while the non-premium lunge (both schengen and non-schengen) has this rule
Free of charge for Finnair Business Class customers and Finnair Plus Platinum, Gold and Silver members (+ one guest with Platinum or Gold cardholder), and oneworld Emerald and Sapphire cardholders (+ one guest), when the departure flight is marketed by Finnair (AY code on the ticket).
http://www.finnair.com/int/gb/inform...irport/lounges