Well they did agree that a diesel is a piston engine......... something the CAA didn't ..... My concern is over my C certification rights......... as its looking under Part M Subpart I.... I will not be able to certify my own aircraft and issue the ARC.......... but will have to cooperate with other companies and do each others....... stupid huh, well as it stands they have not put plastic ones on my licence or wooden under C even though I hold the group with limitations........... there appears no requirement to have the airframe as I will not be certifying the work, simply overseeing the job so i should have recieved it............ will see