The competition at Pembrey in Carmarthenshire, is widely recognised as a stepping stone into the top flight.

BBC Wales's Geraint Vincent reports from Pembrey

With plenty of tight hairpins and high speed curves, Pembrey has always been a drivers' favourite.

And there has been no lack of enjoyment as the Grand Prix stars of tomorrow put their Formula Three cars through their paces.

With just five rounds left to go, the tension at Pembrey is especially high.

Two championship races are being held at the Welsh Circuit this weekend, which means there are a lot of points available.

This year's competition is being fought out by the two drivers at the top of the table - Brazilian Luciano Burti and Britain's Marc Hynes.

Welsh hope Trevor Carlin

Flying the flag for Wales on the home circuit is Carlin Motorsport.

Founded and managed by Pendine-born Trevor Carlin, the team has won two races this season with the first-ever Indian Driver in Formula racing, Narain Karthikeyan.

"We've had a good start to the year, we've won two races and been on the front row three times," Trevor Carlin said.

"We're doing well. Narain is new to Formula Three so we're hoping for great things from him, especially here in Pembrey."

The team's painstaking efforts to get their timings right could all be for nothing come Sunday when rain is a distinct possibility.