This depends on the thickness of wall block you decide to use. Please see the table below;

250mm x 1200mm x 250mm Internal Load Bearing 0.225
300mm x 1200mm x 250mm Internal Party Wall 0.224
External
300mm x 1200mm x 250mm Standard wall block 0.20
350mm x 1200mm x 250mm Passive Standard 0.15
400mm Passive Gold 0.12
450mm Passive Platinum 0.10
Basement Block
350mm x 1200mm x 250mm Standard basement block 0.20
400mm x 1200mm x 250mm Passive Basement Block 0.15