Derek Slack Motors is Authorised and Regulated by the Financial Conduct Authority. () Finance Subject to status. Other offers may be available but cannot be used in conjunction with this offer. We work with a number of carefully selected credit providers who may be able to offer you finance for your purchase. Derek Slack Motors - Prospect Place, A66 Cargo Fleet, Middlesbrough, Cleveland, TS3 8AR. Companies House Number:02977516. FCA number: .