I do indeed, post now edited.
I wouldnt worry too much about that, I think folk get generally far too hung up on 'correct' livery shades. Particularly after the 1964 changes, despite what the official line might have been, all sorts of shades and hybrids could be seen. It would soon darken in traffic, particularly coal traffic, though you might want to consider toning it down by way of working towards the subtlety of the others.
I can identify with both of these posts. Once you've cracked a technique, it's very easy to start applying it to everything. In my case though, I've been working on so many of these things for so long that they can't hep but look different. Dave's point also touches on the idea that although weathering should definitely be based on the real thing (and an amazing amount of it patently isn't), it is sometimes advisable to 'interpret' the prototype rather than slavishly copy it. I suppose that's where the artistry comes in.