I've emailed, with pictures, the chap, at Honda in York that organised all the bodywork.
It is a pearl paint, does that make it very tricky to match up colours?
The rear wheel arch on that side was the one sorted for rust, so I assume they re sprayed that rear quarter, they did the boot lid as well due to lacquer peel/crazy paving.
I'll await a reply.
I can see it now in the picture with the Door Defender as well. definite colour step.
Marshall Honda got back to me and agreed it needs sorting. Just awaiting a response from the bodyshop.
Thanks guys for being eagle eyed and pointing out, what appears to me now, the blindingly obvious. No point trying to convince myself it's a trick of the light, hehe.