The problem is that the general notice given u/s 299(3) would expire at the end of the financial year for which it was intended unless, renewed in accordance with section 299(3)(b). That would certainly mean no valid notice on record for the new financial year. Therefore, he will have to make disclosure contract by contract, the general notice being no more valid, which will make it tedious for any director.
The wording of the section is 'fresh notice given' , that is to the Board, 'in the last month of the financial year'. Therefore, in my opinion,
even if the letter is dated 28th february 2009, the notice, if it gets served on 1st March (the interval also not seeming to be abnormal from the practical point of view of time interval between issue and receipt), under the circumstances stated by the queriest, it will be in order, rather than allowing the general notice to expire.