Answer:
Yes, Great Britain is guilty of genocide, but we must clarify that this does not mean whatsoever that contemporary British or White Australian people are guilty as well, although they should of course know the acts of the past so that they are never repeated.
Explanation:
The reason why is that before the arrival of the British, there were more than 250,000 aboriginals living in Australia, and by 1920, the aboriginal population had gone down to 60,000. This sharp population decrease did not occur only due to involuntary causes like the spread of diseases, but also because of the many massacres that the British colonists committed against the aboriginals in order to take up their lands.