Taxed on Income before arriving to UK on Youth Mobility Visa

Hi there, I arrived in the UK in late August. I am travelling here for the time being on the Youth Mobility Visa. I have no job. I'm living off my savings. I completed the self assessment and it says that I do not need to submit taxes since I am not making an income here. However, I need to know if I need to pay taxes (here in the UK) on my income from Canada that I made before I arrived here. Specifically, "Are you subject to income tax in that country on your world income (total income from inside and outside Canada)?" Thanks in advance

Hi
Your income arising in Canada, before you came to the UK, is not taxable and does not need to be declared.