Nice array of pics there.
The Spice car, Jesper refers to was green one of 2 cars i think that Martin Thomas ran for Gordy and CS-H.
The Spice car was driven by Neil McGrath in '84-86 and then i think by Skid Scarborough in '87.
Back to the theory of 20 odd TWR Rovers i'm gonna sketch the following then. assuming each year there were new chassis total number each year in brackets:
1983
2x 'Sanyo' & 1x 'Hepolite' BTCC
1x 'Barclay' ETC
(4)
1984
2x 'Sanyo' BTCC (later the Bathurst 'Mobil' cars)
3x ETC (2 Fleet & 1 Gitanes),
1x Supertourisme France 'Marlboro'
1x 'Computervision' Rally but was this a converted race car?
(7)
1985
3x ETC 'Bastos'
1x 'Computervision' rally (same question applies as '84 car)
(4)
1986
4x ETC, (3 'Bastos', 1 white) and
1x France or other European 'Marlboro' ?
(5)
That makes 20 but is assuming several other liveries that appeared like the NZ brown, Pacific white and Herbie clips were just reliveries exisitng cars from previous years?
Another point - the '84 Spa entry has Andy Rouse listed as a driver for the Manthey German Vitesse (although he never raced it) so can we speculate if Rouse was actually the car builder and was asked to drive to help with set ups at all?