Hi Linda- a lot of the arguments have been exhausted following AOG's thread a few days ago covering the money wasted on the same airport project.
http://www.dailymail.co.uk/news/article-4031268/The-damning-verdict-285million-aid-wasted-useless-airport.html
The foreign aid budget is currently fixed at 0.7% of GDP and there is no appetite among the major parties to seek to reduce it, so there is no prospect for some years, if ever, of diverting money from the aid budget to fund important areas like elderly care .
The issues for now are really how we ensure the money committed to foreign is spent in the best way and how we fund important areas domestically. Going forwards though I think there is a case for reviewing whether we should spend more or less on foreign aid in the 2020s, although reducing it would be sending a signal to the world that we are not a major player in economic matters and that we don't want to try to secure business in the future from these developing countries in the future or have any influence on them politically..