Alarms R Us Ltd is a UK resident company that manufactures home security systems. The company's results for the year ended 31 March 2012 are summarised as follows:
Trading profit (adjusted for tax, before capital allowances) - £ 2,110,000
Income from property (note 1) - 110,400
Bank interest received (note 2) - 12,500
Loan interest received (note 3) - 36,000
Donation to charity (note 4) - (1,800)

Note 1 - Income from property
Since 1 January 2012 Alarms R Us Ltd has leased an office building that is surplus to requirements. On that date the company received a premium of £80,000 for the grant of a ten year lease, and the annual rent of £30,400 which is payable in advance.

Note 2 - Bank interest received
The bank interest was received on 31 March 2012. The bank deposits are held for non- trading purposes. There were no accruals of bank interest at the beginning of the year.

Note 3 - Loan interest received
The loan interest was received on 31 March 2012. The loan was made for non-trading purposes to another UK company. There were no accruals of loan interest at the beginning or end of the year.

Note 4 - Donation to charity
The donation to charity was the amount paid under the gift aid scheme.

Note 5 - Industrial building
Alarms R Us Ltd has a new factory constructed at a cost of £140,000 that was brought into use on 30 September 2011.

Note 6 - Plant and machinery
On 1 April 2011 the tax written down values of plant and machinery were as follows:

In addition to any items of plant and machinery included in the cost of the industrial building (see note 5), the following assets were purchased during the year ended 31 March 2012.

Required:
a) Calculate the PCTCT and the corporation tax payable by Alarms R Us Ltd for the year ended 31 March 2012.
b) State the relevant due dates for payment of the corporation taxliability.