Also good is 100mm 'common' blockwork exterior leaf with 105mm full cavity fill (silver bead blow in) with a 100mm 'common' blockwork interior leaf.
Such as Certainfill Graphite 27 plus. That will give you 0.27 U-value with a 305mm over all wall.
Not all full cavity fill will give you 0.27 at 105mm, beware.
Advantage:
Normal cavity wall construction but with NO insulation worries like coldbriding, gaps at corners, up to 20% (thrown all over site) waste cut offs...
Block layers are not insulators!
Use smooth ties.
When walls are up, roof on windows in, basically cavity closed all around.
Let the pros blow in insulation into the cavity.
Your architect should be happy with that!
You can up the u-value by using a Quinn lite on the interior cavity leaf.
Usefull link on Insulation agrement certificates:
[broken link removed]
Then go to Product area , Select a Catagory.