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In page Joseph Chamberlain:

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Balfour lost his seat in Manchester East, and although the Unionists were now out of government for the first time in a decade, Chamberlain's position among them was at its apex. With the support of approximately 102 of the remaining 157 Unionists, Chamberlain became acting Leader of the Opposition after the election, and it appeared that he might become permanent leader or win a major concession in favour of tariff reform. Chamberlain asked for a party meeting, and Balfour (returned to the Commons) agreed on 14 February 1906 in the "Valentine letters" to concede that,[citation needed]