yep it's visualising it in the space - the blocks themselves are 'straight'! It is in my 'head'. The architect thinks it's fine, FYI. I think the fact that we've gone through the 'trauma' of digging up founds and making difficult decisions and losing our reference points has really confused me here, and causing some sleepless nights. But I do have this niggle which I'm struggling to address, thus turning to this forum. Your comments are all helpful, thank you.