@Dioramartin - they look very similar in daylight, the difference really is barely visible.
@18bravo - The sprue goo is just old pieces of sprue dissolved in Tamiya Extra Thin. I makes a great filler for seamlines as it bonds to the base material and sands nicely because it is styrene. The downside is that if it is applied thickly (like I did here) it takes a few days to fully cure and can shrink a bit. I will report back and show how it progresses.
@Joel_W - I’m leaning towards the black primer base as well, looking at reference images of the Silver Birch DB5 cars there doesn’t seem to be much of a green undertone at all.
Cheers, D