The plant, described as ‘word class’ by Vauxhall CEO Nick Reilly, is the only place in the world where the new family estate car is built after production started at the end of 2010.
This week the 100,000 model rolled off the production lines, giving the 2,100-strong workforce something to celebrate.
The Vauxhall Astra Sports Tourer was the second model to be launched in the new Vauxhall Astra range, joining the three- and five-door hatchback version.
The milestone model was welcomed by Vauxhall’s longest-serving employee John Cooper, who started at the plant in 1967.
He said: "I am extremely proud and honoured to be chosen to accompany our 100 000th Sports Tourer as it leaves our plant and presents itself to the world.
"It is a great car with a confident and elegant ride and great looks. I am looking forward to sending many more to future Vauxhall customers and customers all over the world."
The hatchback version of the Vauxhall Astra is also built at the Ellesmere Port plant in Cheshire, but the plant is the only place the Sports Tourer is built.
It is exported worldwide, but 6,316 of the models were sold in the UK since its launch, outstripping sales of its main rival, the Ford Focus Estate.
The Vauxhall Astra Sports Tourer starts from £17,270 and comes in four specification levels; ES, Exclusiv, SRi and the top of the range version, the Vauxhall Astra Sports Tourer SE.
All models come with black roof rails, electronic stability control and an audio system with CD and MP3 compatibility.
Higher specifications add equipment such as alloy wheels, Bluetooth and leather upholstery, depending on the model specified.
The Vauxhall Astra Sports Tourer, made in the UK, is available to buy now from UK Vauxhall dealerships.