Finally cracked it!!
After changing dizzy cap,rotor arm,plugs,coil,dizzy
A wire on the connection to amal valve was bared & was touching a braided water hose which in turn was shorting out acroos the braided oil feed to turbo ( so much so that in put a hole in oil feed mmmmmm not too much oil pi***d out!!!)
Running like a dream again
Thanks for your replies guys
regards
Bob