OK, here are some observations after having lived and worked here for 14 years.
Brits are far more adverse to most change and warier of political change than Australians. Aussies tend to "Give it a go" whilst Brits are more cautious.
Even though #Brexit has been politically polarising, Brits for the most part are moderate in their political outlook both Labour and Conservative voters. The extremes, which the current @GBNews is trying to exploit represent a very small portion of the population.
In Australia and the USA this is not the case, there are larger numbers of people drawn to extremes than in the UK. In my opinion, @GBNews went too hard from the off, to attract and keep a large audience in the UK, you need to be balanced, even if your bias is in one direction.