I'm cool with YCHTT's suggestion of 3 rounds although I my original idea was to for each player to take turns playing England, Normandy and Norwegians so we would iron out any advantage each country would have.
How about:
E=England
NM=Norman
NW=Norwegians
Round one:
1 E, 6 NM, 9 NW
2 E, 5 NM, 8 NW
3 E, 4 NM, 7 NW
Round 2:
1 NM, 6 NW, 9 E
2 NM, 5 NW, 8 E
3 NM, 4 NW, 7 E
Round 3:
1 NW, 6 E, 9 NM
2 NW, 5 E, 8 NM
3 NW, 4 E, 7 NM
Final:
Open to ideas on scoring systems but essentially winners of each group would then progress to finals with the same system:
Winners: group 1 E, group 2 NM, group 3 NW
Winners: group 1 NM, group 2 NW, group 3 E
Winners: group 1 NW group 2 E, group 3 NM
Based on whatever we agree is the scoring system, whoever gets the most points is declared winner, 2nd most points 2nd, 3rd most points 3rd.
If I'm over complicating things happy to go to YCHTT's simpler solution. Entirely open to you guys.