Aha, I'm looking more and more towards Rose Gold as it looks less likely I'm going to be able to get my hands on a matte black 7 Plus before November for iUP. It's just I've had a white-front iPhone for like 4 years and eager to switch to black for a while.
I did toy with the idea of going for the Matte Black in 256GB on o2 but the fact it's prone to marking (without a case) kind of put me off.
It's a shame they don't do a darker front for the Rose Gold colour as I think it'd look smarter personally.