So I spent the evening optimising, reducing texture sizes manually etc etc etc - I find blenders behaviour a bit odd because at times it dropped (even in viewport shading mode) as little as 1.3gb then suddenly for no reason it’d side at 3.7gb, so it’s been hard to measure the impact. However in general terms I managed to get it to average out about 2gb.
I’ve since added some detail and it’s crept back up, I’ve fixed some issues and whilst I still need to finish the brickwork it’s looking, I’m sure you’ll agree, a bit better than before. Though I am really on my limit now, I’m getting errors about half the time for GPU rendering.
If it really has to be a better GPU then fair enough, I’m just aware I wanted to make quite a few buldings in this scene and if one is killing a 4gb card, then an 8/12/16 isn’t necessarily going to hold up well is it 
So I might still need to learn better optimisations.
