I have a rather large head and face, most glasses I have tried don't fit or the lenses look stupidly small against my head, does anyone know of any shades that are suitable for the man with a generous head size?
Same problem here. I have to stretch the arms apart to fit. Plus I have a broken nose and the bridge is tiny, so most just end up keeping the sun off my cheeks.
Briko, PBK and most cheapos don't fit.
I might try Oakley Jawbones, lots of dosh though.
Adidas do large sized frames.
Gold Fish Bowl 
Similar problem here - except a chunky bridge on my nose means sun burnt cheeks but well protected eyebrows! 😯
I've a large head and found that Oakley Jawbones are the best fit - close enough across the bridge of the nose and to my cheekbones that dirt / insects etc don't get into my eyes. They're also pretty wide. I prefer the swappable lenses system to that of the Half Jackets or Radars - much easier. My commute starts in the dark so I swap out hi-res yellows for iridiums on the train - they've held up well to daily use for the past 9 months or so.
That said, XLJ (sp?) Half jackets weren't too bad. Certainly not as expensive as the Jawbones.