How much/little of the money Oxfam gets from us actually goes on charity?

I’ve been trying to make sense of Oxfam’s accounts to see how much/little of our money actually goes to charity. Here are some first thoughts.

Oxfam’s total income last year was £385.5m. But only £286.5m was actually used for what Oxfam and the Charity Commission call “charitable expenditure” – a reasonable, but not impressive 74.3%. […]