You get an Apple product. At least, for me it was that simple. The ThinkPad I had was pretty high end, and I was using polarized glasses and even a sun shade to work at the park while the girls played. Bought a MacBook and the screen seems to crisply outshine even the sunniest days -- I haven't had to worry about outdoor use since, to my recollection.

Back when I did much work outside, I used a laptop that had accidental transflective characteristics. In bright sunlight, the LCD actually become quite clear monochrome, with some pixels acting as mirrors and others not, but I don't think they designed the LCD to do that.

I'm not OP but I work outside and use light mode. Macs are generally fairly bright as long as you aren't in direct sunlight. Solarized light mode for the win though.

Moving to the UK is one option. It's been cloudy for about 7 months!