Woodland Grey has a green tinge as well! It will look great with the caper I reckon! The gutter/fascia may come up a bit darker than the roof, but even when people have a Woodland Grey roof and gutter/fascia the gutter/fascia looks darker than the roof because of the angle. I love the Caper colour.
thanks joles for the vote of confidence - i generally love your colour choices so maybe i need to "trust in your wisdom " and have a little faith lol...in real life it looked good though with my samples - i was also considering dune render, have a sample pot to play with...we'll see how it goes...