In reply to HeMa:
I'm not sure, the policy for standard cover has this
'For ascents of mountains with a summit height
above 6,000 m, a separate insurance is offered.
Information and documentation, see:
www.alpenverein.at/versicherung
The insurance protection also extends to accidents
that occur when taking part in the activity of mountain
climbing with exceptional risk (climbing at difficulty
level 5 UIAA and up, free solo ascents (unsecured climb-
ing) and icefall climbing).'
But that actually answers my original question so thanks!
It's not clear if uiaa5 is covered by basic cover, but the above suggests not..
Ollie