A company (which is not a member of a group) prepares a set of accounts for the year to 30 September 2021. Calculate the corporation tax liability for the year and state the date (or dates) on which this tax is due to be paid, in each of the following situations: 

(a) Taxable total profits for the year are £4,500,000 and dividends received are £nil. 

(b) Taxable total profits for the year are £1,250,000 and dividends received are £nil. 

(c) Taxable total profits for the year are £1,250,000 and dividends received in the year are £300,000.

Assume in each case that the company was "large" in the year to 30 September 2020.