I went to this today and saw a few of the races (before it got too cold and wet for me!). Saw a few interesting cars - selection below

Lotus Europa
Rescued attachment 2007-06-30 1 Brands Hatch HSCC Lotus Europa.JPG

Lotus 7 S4
Rescued attachment 2007-06-30 3 Brands Hatch HSCC Lotus 7 Series 4.JPG

Formula Junior
Rescued attachment 2007-06-30 7 Brands Hatch HSCC Formula Junior.JPG

Tyrell P34 6-wheeler
Rescued attachment 2007-06-30 9 Brands Hatch HSCC Historic Formula One Tyrell 6-wheeler.JPG

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Looks good. If id have know it was on i may have gone, Doh!!