Removing the tyre of has revealed that the canvas from the
inside of the tyre has parted company with the wire bead- causing the bulge.
No damage was present on the outside tyre wall and no damage to the rim of the wheel.
This is something that I have had in the distant past on road tyres that had done a 1000+ miles- not something I expected on a new tyre.
Have phoned my LBS today and they will take a look at it .
Paul