If your knowledge of British sportscars is limited to knowing that the sleek Union Jack-painted “Shaguar” that Mike Myers drove in the first Austin Powers movie is really a 1967 Jaguar E-Type, then check out the lawn in front of the Woodstock Playhouse on Sunday, September 23 from 10 a.m. to 4 p.m., when the owners of more than 100 British sportscars will converge there with their Triumphs, MGs, Jaguars and Austin Healeys for the fourth annual Woodstock British Car Show.