"New or Start-up companies with a Corporation Tax liability of €200,000 or less for their first accounting period will not be required to pay Preliminary Tax in respect of that first accounting period and will instead be required to pay their final Corporation Tax liability for that accounting period at the same time as they are required to submit their Corporation Tax return, i.e. within nine months after the end of the accounting period, subject to the 21/23 day rule..."
For companies that do have to pay preliminary corporation tax, the first payment is due 6 months into the accounting period. This suggests your accounting period (as filed on Form TR2) is 31st October 2009. I think you should ring your local Corporation Tax office to make enquiries...