Telegraph.co.uk | Plunging oil price boosts trading outfit Tullett Prebon Telegraph.co.uk The broker-dealer said the dramatic declines in oil and related assets, with Brent crude losing two-thirds of its value within two years, had boosted activity among its trading customers. Oil is now trading at around $30 a barrel, down from over $100 ... Tullett Prebon cashes in on volatile oil price with revenue rise |