Should the UK Champs decide the 6 UK teams for the WHBPC?

At the UK champs, the top 8 will progress to the eliminations. Of these 8, how do you decide the top 6?
4 teams will get knocked out in the semis, of those which 2 make up the 6?
What happens if the teams ranked 7 + 8 end up contesting the final?
Tricky...

Usually ranked by performance. Goal difference and such...