“A company which is required to delver a company tax return and fails to do so by the filing date is liable to a flat rate penalty .. (2) The penalty is (a)£100 if the return is delivered within three months after the filing date, and (b)£200 in any other case” (3) The amounts are increased to£500 and£1,000 for a third successive failure, that is where (a) the company is within the charge to corporation tax for three consecutive accounting periods.. (b) a company tax return is required for each of those periods, (c) the company was liable to a penalty .. in respect of each of the first two [consecutive accounting periods] and (d) the company is again liable to a penalty.. in respect of the third period”