Legislation on emergency vehicle driving is actually changing - [legal bit coming up] the Road Safety Act 2006 will, when it comes into force, not allow people to drive above the statutory speed limit when legally justified on blue lights unless they've done a course 'meeting requirements as prescribed by the Secretary of State'. Or something. In other words, there will be a requirement for a course (grandfather rights will apply if you've already done a course that meets the same standards) when everything's been sorted for the "high speed driving" bit. AFAIK though, the law on blue lights being used on a vehicle being used for "ambulance purposes" and the right to claim other exemptions won't change. Thankfully, most trusts explicitly state that CFRs can't use blue lights (with a handful of exemptions ie. a former police driving trainer is one I know of). Which makes sense to avoid the thrill seekers signing up...