Celtic Speed will expand to field three cars in selected rounds of the Porsche Carrera Cup GB, starting at Croft on 13/14 June for rounds nine and ten of the season.Joining championship regulars Tommy Dreelan and Bob Lyons in the Scottish team will be George Brewster, who is also planning to contest the Knockhill races in August.Dreelan and Lyons now plan to contest the rest of the season, Dreelan racing in pro-am1 and Lyons contesting the pro-am2 category, while Brewster will join the growing list of pro-am2 racers.Racer Alan Keith heads the Montrose-based team and has been known to jump back into the driving seat to give one of the cars a shakedown run.