After the war both cars were owned by Sir Ralph Millias who used one as a donor to keep the other running. Crankcase and other engine parts from the donor car were used in the principal car after an engine blow up in 1957; the crankcase and other engine parts originally fitted in the principal car was in the 1970s fitted in the donor car. More recently both cars were fitted and are run with a newly formed crankcases. The ‘principal’ car was thought to be originally fitted with the engine from ‘Tiger’ and the donor car was said to be fitted with the engine from ‘Tigress’. This is the identification followed below