Last week bankers and brokers in the City of London did what they've been wanting to do for so long and started laying into each other. An options trader from Morgan Stanley slugged it out with a trainee from Dresdner Kleinwort Wasserstein. Brokers from Trio Equity Derivatives and Weatherly Securities traded punches. And a senior executive from Hartford Financial Products went head to head with a bond broker from Cantor Fitzgerald International.