The CAA have been involved - and totally on-side - since Day One. Hence the process leading to Permit issue is completely in line with the Authority's requirements.
This is not a gang of well-meaning enthusiasts patching up and old aeroplane to get it flying again - the Vulcan is receiving a total restoration to modern day requirements under the engineering management of Marshall Aerospace.
About the only significant threat to the programme is from the purveyors of doom who have little idea of the whole project.