Advice on laying some engineering bricks pls

[scaffers]

Hi

I have a project thread here

https://www.diynot.com/diy/threads/honestly-how-difficult-can-it-be-rear-extension.528675/

I need a bit of advice on laying the engineering bricks to take the block and beam floor, I need to know as I'm going up 10 courses at the lowest point (garden slopes away) am I best just using the engineering bricks on the inside skin or shall I use the large foundation blocks (440/300/215) for a couple of courses and then engineering bricks for the last few courses. There's some pics on my thread

Thanks

Scaff

 

[^woody^]

Either Ivor.