Higher administration costs hit profits at the UK operations of Greenhill & Co in 2012, a year in which London office worked on multi-billion dollar mandates from the likes of mining company Lonmin and communications group Aegis.

Greenhill & Co International, the London-based business of the US investment bank, published pre-tax profits of £17.5m for the year to December 31, 2012, in accounts filed with Companies House last week.