Junior banker bonuses in London have surged by 60% this year as firms have moved to stem an exodus of talent, with Goldman Sachs the biggest payer in the City, according to new figures.

First-year bankers at Goldman received a bonus of £64,500 over the summer, according to research by recruiters Dartmouth Partners, up by 130% on the previous year as banks have battled a burnout crisis in the junior ranks that has led to new perks and salary hikes across the sector.