Tullett Financial, the market data provider arm of broker Collins Stewart Tullett, is expanding its European operations and has appointed Robert Gray, a former Liffe trader, as European sales executive.

Tullet, which provides interest rate derivatives and fixed income information, is seeing demand for its product grow as technology increases the pace of trading and the amount of information banks and brokers demand. The recent volatility in the fixed income markets has also driven the demand for Tullet Financial's data.