Proposed St Mellion (2011) Bypass
According to the longer term residents of St Mellion, the bypass has been under discussion for decades. Owing to this they are inclined to treat any future plans with a degree of scepticism (and who can blame them). Being new(ish) on the scene, I'm going to keep my hopes high until they move the goalposts again.
This link provides details on the project and proposed timetable. Official County Council Webpage