Contaminated, that is fantastic!

How did you do it?

Now, I have one last question...

Each type and mix of concrete will have an associated figure of embodied carbon. When a particular mix of concrete is chosen, I want this figure to appear in Column H. I have a feeling this isn't that hard to do, just link a cell to the dependingdropdown box no? Any ideas?

But first, really that is amazing, how did you link those boxes?!

If you are ever in England, I will buy you a beer!