Pokémon Go is officially launched in the UK, one day after the release in Germany. It was already available in the US, Australia and New Zealand earlier last week. But nonetheless, some UK Pokémon fans found ways for early access by sideloading the Android APK or using a US App Store account to download the game.
Pokémon Go was released in the US on July 7. Australia and New Zealand got a 12 hour head start before US. The response is overwhelming causing the servers which the game is running on to be struggling with such high demand.