It is common for a company's articles of association to require directors to be given notice of any board meetings - or even of all the agenda items which can be voted on at the meeting. If that is the case, and you were not given appropriate notice, then the decision will be legally invalid. You could advise the rest of the board of this fact, and suggest that a properly constituted board meeting be held. Failing that, you could apply to the court for the decision to be overturned.
In general, however, company law does not entitle directors to such notice. Even where you are entitled to notice of the meeting and its agenda, other decisions could be taken under 'any other business'. The only time when you must be given notice is if a board meeting (or general meeting of shareholders) is to discuss your dismissal as a director. Note that notice of a board meeting need not, unless the articles otherwise provide, specify the nature of the business to be transacted.
The decision would therefore stand, provided that the directors making the decision were not in breach of the articles by failing to provide the absent director with notice of the meeting. Otherwise, your only formal option to change it would be to raise it at a subsequent board meeting.
In practice, healthy boards rely more on negotiation and discussion than legal compulsion. There is no reason why you should agree with every decision that is taken - but if a decision is deliberately taken behind your back, you might feel that you could no longer serve as a director.
