Sorry, not having a go at anyone in particular but the MkIV was built by both AC and Autokraft. Quite how you define which company built what is hardly relevant. Brian Angliss owned AC Cars Ltd (in partnership with Ford for a while until he spent their joint money re-developing the Ace without telling Ford) and Autokraft, at the same time. Initally the MkIV was an Autokraft product, then Derek Hurlock permitted the use of the AC name and logo (happy days) before he sold the business to BA who negotiated the right to use the Cobra name.