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It comes to no one’s surprise to hear that Jaguar is developing a new entry-level model range. It’s losing traction next to other premium brands, and even within the Jaguar Land Rover group, it’s fast becoming an also-ran. JLR racked up a healthy 14% sales increase in the first half of this year, but less than 20% of the 210,190 vehicles were Coventry cats.

A new range of more affordable models is likely to be the best solution for the British brand, especially considering that Land Rover’s two best sellers are its cheaper Freelander and Range Rover Evoque models (affordable and cheaper here are all relative, of course).

Financial Times reports that Jaguar’s new entry-level range will arrive in 2015, consisting of a sedan, an estate and the brand’s first SUV/crossover. The compact sedan, rumoured to carry the XS moniker, will mount an attack on the BMW 3 Series first, with the rest to follow.

In an unprecedented step, however, it looks like Jaguar will be using an all-aluminium architecture (or at least use a large amount of the lightweight material) for its new range. That’s a big departure from the long-dead X-Type compact sedan that used a modified (and old) Ford Mondeo chassis – a move that won it few favours.

Jaguar is no stranger to utilising all-aluminium constructions, having already done so for two generation of the flagship XJ sedan (current model pictured here), as well as the XK and F-Type sports cars. Land Rover too has started to move away from conventional steel architectures, with the latest Range Rover and RR Sport built around all-aluminium monocoques.