I'm using F1TV over here to watch the races. F1 is still free to air in Germany but it's full of ads and there's no coverage of the practice sessions or support races and I find English commentary far easier to follow so I figured I'd give it a shot. The quality is pretty awful for a paid streaming product. The service is unreliable (I'd have missed the first fifteen minutes of the Austrian GP if I'd not been able to watch it free-to-air, and the build-up show for both races has completely failed to air), the quality is worse than the free-to-air stuff, the App and website streaming services are poorly thought out and sorely lacking features (seriously, you can't even pause!), and they haven't even bothered with a SmartTV app yet so I have to hook up the laptop with a HDMI cable to watch it.
You're not missing much not being able to get it in the UK, frankly.