My ambition would be to shrink the differentials between the higher paid and the lower paid so that by the end of my government's first term, it would be something more like 10 to 1 across the country. I'd look into the charity status of any institution in which the pay differentials exceeded that ratio (I would keep a keen eye on loopholes -giving bonuses, special contracts etc) and end their privileges. In relation to corporations and banks, I'd invite economists who are critics of austerity to advise me on how to reform them, such as Paul Krugman, Joseph Stiglitz, and Naomi Klein.
http://www.independent.co.uk/voices/comment/if-i-were-prime-minister-id-shrink-the-gap-between-the-highest-and-lowest-paid-10228616.html