A public servant paid $180,000 more than the NSW premier was "horrified" by the cost of rent and school fees in London and entered fraught negotiations with public servants for extra perks on top of his salary after arriving in the UK.
NSW Agent-General to London Stephen Cartwright says he quickly realised his $600,000 salary package would not be enough for him to live in the UK capital.
"I started to do some of that research as soon as I arrived and was pretty horrified with what I saw," Mr Cartwright told a parliamentary inquiry on Tuesday.