That's not an entire summary, I think. The lack of local (or nodal, as it's often called in the US) pricing means that there's comparatively little incentive to build new transmission. The UK is not a large country, and we routinely build much larger transmission lines (if I'm not mistaken, the UK is the geographic size of Texas, where the exact same problem is being solved effectively).
My comment was somewhat of a critic of the terse headline. Adding a small amount of information to the cryptic headline removes a lot of perceived mystery.
Your statement answers the question, "why is long distance transmission price high?"
