In any walk of life, people will have different opinions to what is best, which is great, as I’m now in a much better position than last night:
a) I now know that using blocks is fine for external walls and I can avoid engineering and face bricks entirely
b) I’ve been introduced to aggregated blocks - so will investigate these compared to aerated blocks
All the work will need to be signed off by building control anyway, but forums really help with the (often obvious) questions that a compete novice struggles to find answers to