Thanks Antoine - that's a very useful table.
It looks as though I may be able to get 10 m and 50 m resolution data from the Norwegian site - but I haven't tried yet. The 10 m data would certainly be good enough for both levels 7 & 9. The 50 m data may not be quite good enough for level 9, though good enough for level 7. Having said that, the default Aerofly resolution is worse than 50 m (not sure?) so maybe it wouldn't be any worse than default?
As far as I understood, there's no more mesh north of N60? If that's the case, then a 50m mesh (Level 8 may also be compiled) is definitely an improvement.
I don't know how far north the AFS2 World can be modelled.
And a good 10m mesh already may provide very satisfaying results.
Cheers
Antoine