National Britannia, based in Caerphilly, is making the new Vectra available to middle and senior managers and says the car fits perfectly the company's health and safety policy.
The firm runs a 250-car fleet on a three-year contract hire basis in the UK, and has other operations abroad.
Group purchasing manager Martin Wiggins said: 'Our transport policy states that the safety and security of our drivers is paramount and the new Vectra has exceeded all our expectations.'
The company has chosen two Vectras for senior scientists and operations managers – the 1.8 SXi and the 2.0 DTi SXi. Demonstrator Vauxhalls have already been made available to National Britannia staff with positive reactions and feedback.
Wiggins, who now has five Vectras on order, said: 'They can't wait to start driving them.'
The remainder of the fleet comprises Astra LS and Envoy 1.7 DTi estates, which are used by health and safety consultants and scientists in the company to carry scientific equipment.