That looks fine.
You now need to assure yourself and check that there are no others issues - height, lightning protection, fixing stability, safety of access ... ,
Thanks, it won't be me getting up a ladder to fix the catenary wire, I am well past getting up ladders. I will just be fixing the items and running the cable on a solid footing!

The fixing of the catenary fixtures will be to solid brickwork on a 1960's building and the other is not much older. Thanks for your concerns.
A million thanks to all who contributed to the thread and a special thanks to ian007jen and MCH for your patience and help given. Without your help this project would not be happening.
Robert