Only if anyone's interested following a post HERE, blockwork going up

 

For a laugh, make it airtight as you can, then pressure test it.  That would be interesting research.

I'll certainly do my best @SteamyTea,  there's a bit of a time pressure with getting it done, but I'll give it a shot

Ah, meant to update this, block done, as well as roof, roof/ground drainage, temporary electric and the basic essentials so I could move in and use the space!

 

 

This is slightly out of date, the fascia is on now, I'll take another pic sometime.

 

Oh dear, I never kept this thread updated, if anyone's interested I'm happy to post my disappointingly slow progress 🙄