Foreign aid - not such a huge chunk of our national spend but massive impact on stability & recovery in disaster zones & communities where it is needed. Again, I will not defend abuses of the system & the cramming of cash into the pockets of the corrupt & despotic, let alone massive armament programmes.
But, funding & supporting basic programmes to sustain health, education, sanitation & skills that allow the population to stay put & rebuild on known lands, restore farming, keep traditions & maintain extending family groups is a far most cost efficient & humanitarian to manage massive uncontrolled refugee or economic migration into neighbouring countries where communities stagnate & loose hope.
So imagine in 1945 at the end of WW2 if people in this country who had lost loved ones, their children sent away, their homes bombed out, their communities dispersed & their pre-war jobs gone, did not receive help (or foreign aid as it was then) to rebuild their lives - no NHS, no state education in local schools, no new houses built, no jobs or churches for community activity. Just stay put & put up, or you can just over that little bit of sea there to refugee camps in the USA somewhere or other, rather than have the US Govt send aid directly to the UK.
This country had foreign aid to rebuild after WW2 & it was effective (enough) to overcome the destruction of the war.
