Schedules for the next round of TV coverage of the 2008 Charterhouse Heritage GT Car Challenge have been announced.Highlights of the races at Snetterton on 20 July will first be screened on Sky Sports Extra during the early evening of Tuesday 12 August, with a further seven repeat broadcasts.The provisional broadcast schedule is as follows:Tuesday 12 August at 18.30 on Sky Sports ExtraWednesday 13 August at 01.30 on Sky Sports ExtraWednesday 13 August at 09.30 on Sky Sports 2Wednesday 13 August at 13.00 on Sky Sports 2Wednesday 13 August at 14.30 on Sky Sports 3Saturday 16 August at 01.00 on Sky Sports 3Saturday 16 August at 21.30 on Sky Sports ExtraSunday 17 August at 14.30 on Sky Sports 3