Breaking from speed there was an apparent juddering as if the front disks was warped. They were fine.
Coming up to traffic lights and slowing a pulsing feeling through the bike, making me thing the road surface was uneven, this is often referred to as ‘wash board’ effect. It was not that.
The problem found and resolved.
Front right hand side wheel bearings, finally gave way and informed me of the strange symptoms. There was no other symptoms and I had checked the bearings only week before and now obvious ‘play’ there.
All good now!