The 1964 Sunbeam Imp was the Rootes Group’s ambitious, albeit troubled, answer to the Mini. Characterized by its innovative rear-engine, rear-wheel-drive layout, the Imp featured a lightweight, all-aluminum 875cc engine derived from a Coventry Climax fire-pump design. This allowed the car to be surprisingly sprightly and rev-happy, while its unique lifting rear window (a precursor to the modern glass hatch) offered practical access to storage behind the rear seats. However, despite its clever engineering and excellent handling, the Imp's early reputation was marred by reliability issues—specifically overheating and pneumatic throttle failures—largely stemming from a rushed production launch at a brand-new factory in Linwood, Scotland, far from the company’s experienced workforce in the Midlands. Though it never quite stepped out of the Mini's shadow, the 1964 Imp remains a cult classic celebrated for its technical audacity and "giant-killer" performance in touring car racing.