Although given that the Australian version is "autofilled with any data they've already received (e.g. salary paid and tax withheld by employers)", it's definit

Although given that the Australian version is "autofilled with any data they've already received (e.g. salary paid and tax withheld by employers)", it's definitely not as good an example as them. The UK system requires you to do a lot of working out yourself, including if you have crossed certain complicated thresholds related to pension contributions.