An update on my brakes , new discs and pads fitted, Happy Days..it is like a new car!!
The discs were marked in a way that the pads were only making contact in parts, hence the uneven braking. So I assume the were slightly warped.
Thanks to all who replied to my posts and for the advice. Hopefully it will be a long while before I need to do them again, but it turned out to be quite straightforward. The only hiccup is I am waiting for new locking tabs before I can torque it up and road test properly, but just a trip down the drive instantly felt better.
Bob