Sales will begin shortly after in July, starting at £28,120 for the Giulietta and £20,210 for the MiTo.
In Quadrifoglio Verde spec – often known as Cloverleaf in the UK – the updated Giulietta will feature the 237bhp aluminium 1.75-litre turbocharged petrol engine that first appeared in the 4C coupe, which generates 340Nm of torque.
Paired to Alfa’s TCT 6-speed dual-clutch gearbox with Launch Control system, which also makes its way over from the Italian manufacturer’s new sports car, the Giulietta QV will manage 0-62mph in 6 seconds flat.
Although 0.8 seconds faster than its predecessor and capable of a 149mph top speed, the Giulietta is also compliant with Euro 6 standards, emitting 162g/km of CO2 – a reduction of 15g/km.
As well as new intake and exhaust systems to help the Alfa audibly stand out, there are visual cues in the form of lowered sports suspension, dark-tinted rear windows, and an Anthracite finish for the front grille, wing mirrors, door handles and fog-light frames.
Completing the look are large twin exhausts, 18-inch alloys, red Brembo brake callipers and a Quadrifoglio Verde emblem on the front wings.
The inside is marked out from the standard Giulietta by wraparound sports seats, a new flat-bottom steering wheel, QV logos, alongside front and rear parking sensors, and 6.5-inch touch-screen Uconnect infotainment system.
A limited-run ‘Launch Edition’ model builds on this specification still further, offering carbon fibre details, new side skirts and rear diffuser, as well as burnished 5-hole 18-inch alloys ans a unique numbered plaque. 100 of the 500 to be made will make it to the UK, priced from £30,280 and available in new matt Magnesio Grey.
The Quadrifoglio Verde trim MiTo benefits from a similar range of updates, distinguished by a burnished finish on the headlight surrounds, front grille, door mirrors and handles, and the taillight surrounds. There are 18-inch alloys and the same red brake callipers, too.
Marking out the interior is a ‘carbon look’ dashboard, black leather with white stitching and new instruments. In car tech again comes in the form Alfa’s Uconnect multimedia system, fitted here with a slightly smaller five-inch touch-screen.
Power for the MiTo QV will come from a 1.4-litre MultiAir turbo petrol unit, developing a maximum 168bhp and 250Nm of torque. Alfa Romeo claims it’ll clock 0-62mph in 7.3 seconds – making it 0.2 seconds quicker than before – as it heads to 136mph.
Despite that, it will still manage 52mpg and emits 124 g/km of CO2, thanks to the new TCT gearbox, fitted to the MiTo without Launch Control, and a stop-start system.