I think my chainline is out by slightly too much of a margin, my chainring is wearing on one side much faster than the other and on examination the chain tends to pull to one side of the ring. . . I can't remember exactly how I calculated the chainline, I swapped the original chainset out around 2 years back and haven't messed with it since. I don't have the option of moving the ring closer towards the frame as there isn't space, it'll touch. The Sturmey Hub is one area of my bike that I've not delved into beyond setting the gears correctly, is there an easy way to move the cog for chainline adjustment?