"3. Reduce the dominance and negative impact of roads and traffic and ensure any improvements to the A303 support this.
4. Improve the interpretation and enhance the visitor experience of the wider landscape."
Both of those look to have been carefully designed to provide ticks if they succeed in achieving a short tunnel.
"5. Ensure any development is consistent with the protection and where appropriate enhancement of the monuments and their settings and wider WHS landscape and its setting."
... and that looks like a further attempt to provide scope for another tick, but IMO it can only be earned by spinning the reality. Affecting or destroying features is unavoidable if you're going to build massive entrance trenches inside the WHS so you're going to have to tell the public it's worth it as it'll enhance the rest. I don't think that's either true or within their remit but they're being forced to do it to help the Tories win the election.