It's actually a pleasing light gray. Wish the picture did it justice. Most white roofs are very... well, WHITE, and they tend not to stay that way. You're welcome to come look, but it looks like your trip would be a bit long!
Many home improvement stores have a large sample patch installed on the wall and smaller sample boards you can take home with a deposit. Since you aren't in the US, the specification you are looking for is "Initial Solar Reflectance". Energy star criteria are that this number must be at least 0.25 and maintain 0.15 SR after 3 years. Mine are 0.27, higher is better.
Landmark Solaris Platinum shingles from Certainteed have an ISR of 0.40 but are $$$ because of higher cost per square and more bundles to cover 1 square.