Dominic House has kindly provided a photo of the Class of 1985 which is also on Facebook:

The Class of 1985
Left to right: Grahame Bryant, Andy Garlick, Peter Garland, Andy Downes (series co-founder), Jim Deacon, Norman Stechman, Jack Bellinger, Richard Casswell, Barry Sumner, Leigh Sebba, Steve Spencer (original handicapper for the Challenge), Barry Iles, John Milbank (driver and series sponsor in 1985), Rick Bourne (series co-founder), Dave Freeman, Mary Lindsay.
The cars in the photo competed in the first ever round of the Challenge in 1985.
Everyone took part in the series from the very start and of those who were on the grid in the first ever round of the Challenge six were racing at Brands Hatch on Monday: Grahame Bryant, Jack Bellinger, Barry Sumner, Leigh Sebba, John Milbank and Mary Lindsay.