Nice shot Dougie, very nice. Give yourself some credit mate, there's an awful lot of submerged reflection nebula in there as well, muckin' up the Ha. I know Eta gets done to death by many people, but its not an easy one to get right. As the Sidonizer said, up the saturation a bit and see how it looks then.
That's why I don't do RGB mate, those damn blended star halos
Too frustrating for me. Good on you for getting in there and having a damn fine go.