Top soprano Kathryn Harries gave a dramatic demonstration of the Lloyd's building's acoustics when she broke its usually studious atmosphere. Insurance workers in the underwriting room downed pens to hear Harries perform a spellbinding recital in front of the Lutine Bell.

Harries, who is appearing at the Royal Opera House, was singing in support of the stroke and head injury rehabilitation charity Speakability. Later this month, Harries will be making a fundraising walk from John O'Groats to Land's End for the charity.

Lloyd's charities trust chairman presented a £80,000 cheque to Harries for Speakability. She also gave a recital in the Adam Room to 100 guests.