Teams continue Brazil build-up

Jordan concentrated on building reliability during Thursday's test.

After completing 400 km on Wednesday, Jarno Trulli put in 85 laps of the Northamptonshire track yesterday.

The Italian's EJ10 was third quickest, after Jenson Button's Williams and Olivier Panis' McLaren.

However, less happy with its progress was Prost-Peugeot, who encountered more of the electronic problems that have blighted its 2000 campaign so far.

The team's sporting director John Walton said: "It's clear that we still have a lot of work ahead of us, especially on the electronic system in order to improve the car's reliability.

"We have progressed a little in performance but we have not been able to advance as we wished, because of the problems encountered in other areas.

"This session has allowed us to gain mileage on the car and hope to understand it a little more."

Jean Alesi was fifth quickest yesterday, more than six seconds behind Button.