I think these are extremely valuable opportunities for:
-learning: how to create effective programmes that make a difference
-networks: getting to know people across government in the UK and internationally
-direct impact: working to improve social programmes at home and abroad
-career capital: management, evaluation and behavioural science skills set, as well as your next employers knowing that you gained these skills at a highly respected and innovative organisation.
3 or 4 jobs in the UK and New York.
Note that the deadline to express interest is in two days! If you want one of these you should apply quickly.