Over 1,000 Alfa Romeo cars were sold in May compared to just 549 in the same month last year as the Italian brand almost doubled its market share.
In total, Alfa has sold 77.71 per cent more cars in 2011 compared to 2010 despite overall car sales falling by over seven per cent in the same period.
Alfa has always had passionate fans, often referred to as Alfista, but recent new cars from the brand have shown more universal appeal since launch.
The Alfa Romeo MiTo supermini uses Fiat Group engines to lower CO2 emissions and offer one of the most environmentally friendly Alfa Romeo cars ever built. CO2 emissions fall below 120g/km for MultiJet diesel engines, meaning first year free VED and £30 per year in subsequent years.
Diesel engines are increasingly popular in the UK, taking up over half of all new cars sales, and the MultiJet engine is regarded as one of the most efficient available in a small car in the UK.
The second new model, the Alfa Romeo Giulietta hatchback, was designed as a rival to the Ford Focus and its five-star safety rating and high quality interior specifications are aimed at family buyers looking for a sporty but practical car.
The success of the two models is evident in sales figures for 2011, which has seen 5,500 new Alfa Romeo cars sold from Alfa Romeo dealerships.
In future, Alfa expects to expand sales further with the introduction of the Alfa Romeo Giulia, a saloon designed to replace the ageing Alfa Romeo 159.
With a new three-strong range, Alfa Romeo will then focus on bringing the stunning Alfa 4C roadster to market after a concept car wowed crowds at the Geneva Motor Show at the start of the year.
The Alfa 4C roadster is expected to arrive at UK showrooms in 2013.