More than three quarters of the UK’s largest companies are expected to review their corporate broking arrangements this year as instability and disruption at several leading advisers triggers the biggest shake-up of the broking landscape for 20 years.

Dresdner Kleinwort's withdrawal from the market, group-wide turmoil at UBS and Citigroup, a strategic review at Royal Bank of Scotland and the fallout from the recent takeovers of Lehman Brothers and Merrill Lynch have led many FTSE 100 companies to reconsider their existing relationships, with many mandates expected to change hands as a result.