Pete... I think you will find car 22 is John Harris... with both cars entered in "The Lakeside 1500" event for Production Touring Cars, on 29th November, 1970. As for the Valiant Pacer behind, its a bit hard to tell without a number, but could also be either of the Geoghegan brothers, who each had an Austral Motors Pacer, or Alan Whitchurch, driving for P.J. Motors... and based on the sign on the back of the car, I think it is likely to be the latter. :-)