Total =23 ... according to the MGR database, that is.
Of the ZT-T's, 'Two-Sixties' Members own #123 and #431 currently but #577 is no longer with us, having been used as a donor car in the resurrection of (one of the two!) VIN #005 cars, the technical/electrical documentation "photo model" and classroom training car, VIN ....GB3D000005.
Photographs of all but 4 of the 23 Trophy Blue cars can be seen in the Forum "Photographs of Cars - Ordered by VIN" Gallery (missing are #113, #145, #245 and #368).