They want to speak to the driver of a blue X-registered Mercedes 230 CLK that was seen driving with the Seat Leon immediately before the incident.

BBC: Halifax car crash: Mother killed, six men arrested

Smaller than the larger and swanker CL- and SL-Class models and larger and costlier than the two-seat SLK-Class, the since-discontinued midsize Mercdes-Benz CLK-Class can be found in both sporty luxury coupe and convertible versions.

FORBES: Mercedes-Benz CLK-Class

So we see boring names like CTS, EXT, LS, XLR and 3.2TL. It's an effort to copy Mercedes with its C and CLK and SLK. Letters are also big for super high-powered jobs, like M (on BMWs) or V (on the Cadillac CTS) or R (on Volvo).

FORBES: Nameplate Engineering Is Bad Business