cars for group 4, including pistons, manifolds, carburettors, and suspension, etc., that could be fitted without the FIA needing to recognize or approve them. However, the BL rally team had to regain approval for the 16-valve head for the 1978 season, and several others such as Lancia, Toyota, Vauxhall, and Ford had similar problems at that time. This was because the FIA deleted the 100-off rule from 1976, though mechanical parts and cars already using it were allowed to be used until the end of 1977. The number of cars suitable for "normal sale" required to gain approval of such a modification under the 1976 rules does not appear to be recorded. However, several other similar modifications of the era, including the Vauxhall Chevette HSR, Porsche 924 Carrera GTS, and possibly Ford RS rally cars, involved production of batches of 50 cars. This may explain, at least in part, the production of the 60 or so 16-valve TR7 Sprints in 1977. Their use in this homologation process is shown by 6 photographs of a TR7 Sprint (later registered SJW 530S) described in the British Motor Museum Film and Picture Library archives as "TR7 Sprint Homologation". The V8 version was homologated on 1 April 1978. This was homologated as a separate model, the TR8, directly into group 4, but because the TR8 had not yet been launched "as a compromise to keep the BL marketing people happy, it was called the TR7V8 instead." At that time, appendix J required 400 cars suitable for "normal sale". However, the number produced by April 1978 is believed to have been less than 150. Journalist and historian Graham Robson quotes John Davenport as saying "In those days there was no rigorous FIA inspection system. Provided that one provided a production sheet signed by an important manager, then nobody worried". Robson goes on, "A lot of fast and persuasive talking then went on, to show that the makings of well over 500 [sic.] cars were either built, partly built, or stuck in the morass of the Speke strike—the result being that homologation was gained." However, the FIA rules are specific that these should be "entirely finished cars, e.g., cars in running condition and ready for delivery to the purchasers." Also, the Ford Escort Mk2 RS1800 was re-homologated into Group 4, as the 2 L Escort RS, with only about 50 produced in 1977 and only about