Put the LEDs on flash, not a problem as far as the law is concerned. In fact, if the Cateyes flash, and you don't need them to light up the road, put them on flash as well. Nothing shouts "Cyclist" as much as a decent set of flashing lights.
Does the Hi-Viz vest have reflectice strips? If not, splash out on one that does, but the most effective of all is reflective material on your legs/shoes/feet, as the movement catches the light better.
Thanks for the quick reply Cubist!
I definitely need to have the main front on to light the road, the lanes are a bit dark round here. I do have reflective strips on the vest (pays to be in the construction trade) and I have a few spare so I could always try and 'fashion' some for around the ankles.
I also have a 2nd CatEye front light but have no idea where the bracket is - Anyone got any bright (no pun intended) ideas on how best to fix a light to the bars without a bracket? Thanks again Cubist.