"I strongly wish to register my view that by justifying the decision to block the Gaza appeal on the ground of impartiality, the BBC's director-general has done greater reputational harm by implying that the DEC has not been objective in this case," reads his letter.

Alam, a former vice-chair of aid organization War on Want, also said that he knew of at least one other committee member who was thinking about resigning over the decision.

Despite the BBC refusal, the aid appeal raised more than £4 million for the besieged Gazans.