When is a country too wealthy to receive international aid?

Britain will give £280m ($457m) in annual aid to India for the next four years. These figures aren’t very high in the scheme of things but this is aid given to a country with an economy growing at 9%, that has it’s own space program, spends billions on defence and even has it’s own overseas aid program. I don’t deny that there is real poverty in India but wouldn’t it be better to offer help in other ways? Maybe by sending representatives from Her Majesties Revenue & Customs to advise on better ways to collect and distribute tax so India can better help it’s own people?