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Subject to anything to the contrary in the articles, adirector may resign his office at any time by proper notice to the company, unless the articles provide otherwise.
The resignation will be effective in accordance with its terms, independent of any acceptance by the company (unless the articles provide for acceptance) and, once a director has served a notice of termination, the director may not withdraw it without the company's consent.
Where there is a dispute over the meaning of aresignation notice, the test will be whether the notice was sufficiently clear and unambiguous that it would leave a reasonable recipient in no reasonable doubt of its meaning.
A company's articles will generally provide that the office of director will be vacated if he resigns by notice to the company.
The company may dispense with formalities for resignations set out in the articles. You can check this.
A resignation will be effective even where it is in breach of the director's service agreement.