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This is how I've done it.
1.) In "FRONT VIEW" I drew a circle (obviously any radius)
2.) Switched to "TOP VIEW"
3.) Drew an Arc to required point (osnap "CENTRE" )
4.) Typed " EXTRUDE" and selected the circle.
5.) Command Line--- selected "PATH"
6.) Clicked on the Arc.
I'm well chuffed. Thanks for all the pointers all. The bits of yours I didn't use I will play around with to see what happens.