Well this has turned out much crappier than I imagined.
To be honest, I hadn't a clue that the sea green color was supposed to look like weathered copper! But you're saying that it is?
Yes. Wentworth is obsessed with patinaed copper, as Wentworth Hall has a copper roof - ergo, they must must must use it in all construction... *rolls eyes*
I was giving an architectural tour (tours actually) this weekend to some of the best architects in the country.