Done today. I filled the terracotta blocks with a 6:1 sharp sand mortar with SBR (since I had plenty SBR) and also used that mortar to lift the first course 50mm. That offset allowed me to tie in the blockwork using 100mm masonary nails as noseall suggested. I used two per side every course, pushed in to the sharp sand fill. The blocks were laid with 5:1 mastercrete.
Hopefully no cracks tomorrow. I'm planning on plastering with Hardwall on Sunday so the wall isn't too green.
Hopefully no cracks tomorrow. I'm planning on plastering with Hardwall on Sunday so the wall isn't too green.