From £31,065

New version of Audi A3 and Mercedes-Benz A-Class rival majors on refinement and under-the-skin improvements

In switching from rear- to front-wheel-drive, the third-generation 1 Series that arrived in 2019 marked a dramatic change from its hugely successful predecessors. The change in layout prompted a design makeover as well, with the machine adopting a somewhat more traditional family hatch design.

This fourth-generation 1 Series is much more evolutionary, so it has a very familiar feeling. It has grown slightly to 4361mm long (an increase of 42mm) and is slightly higher, at 1459mm.

At the front, the kidney grille has been lowered slightly so it now sits below the front headlights, while the grille itself no longer features chrome surrounds as part of a general effort by BMW to make its materials more sustainable.

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The headlights feature standard LED daytime running lights that feature large vertical bars, while the side profile remains based around a ‘wedge’ shape. There's a spoiler on the back lip of the roof and reworked rear lights to boot.

Another new style feature is a little more subtle: you will now find the number 1 embossed on the inside of the Hofmeister kink on the C-pillar. Thankfully, it has been subtly done.

Under the skin, the new 1 Series focuses on refinement. Extra struts and crossbraces help to increase chassis rigidity, there are new shock absorbers, the anti-roll bar mounts feature higher pre-loading and the front-wheel castor angle has been increased to aid steering feedback. Wheel sizes now start at 17in, with higher-level cars running on 19s.

While pure petrol and diesel engines will be offered in some markets, UK buyers get a choice of just two – in contrast to the A3, Golf and A-Class, which remain available in many varieties.

The 1 Series range starts with the 120 driven here, with a 168bhp three-cylinder turbo engine boosted by a 48V mild-hybrid system in the gearbox, in Sport and M Sport trims.

There’s also the M135 xDrive, which we’ve also driven and which offers 296bhp from a 2.0-litre four-cylinder turbo engine, down 6bhp from the previous generation. Power is delivered through all four wheels.

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Both engine variants are automatic-only (that’s right: you can no longer get a new 1 Series with a manual gearbox) and now use the same seven-speed dual-clutch gearbox.

The M135 features a raft of extra chassis upgrades, thanks to its adaptive M suspension, with further upgrades found by adding an M Technology Pack.

The adaptive M suspension, which can lower the ride by up to 8mm, is optional on the 120 and was fitted to our test car. It features frequency-selective dampers and features stiffer rear-axle bushings and (even more) extra crossbraces.