Thanks for the feedback chaps.
I’ve employed the strip of tape on the top of my visor for a while now too. I first added it as my ride home from work was eastward bound, and in winter after nightshifts, the low sun was a real pain. A strip of tape does a pretty good job most of the time. Try it.
The other great addition is a photochromatic Pinlock, ace piece of kit. Got my last one from the Arai service stand at the rear of the TT Grandstand for £20, bargain.
R-kid has an Arai with the added Pro Shade sun visor, says it works well without ever feeling it’s about to fly off.
I quite like the Bell MX9, looks like a decent option, but will probably keep my eyes pealed for a reasonable priced Arai Tour-X.
