Joining British Gas' 10,500-strong fleet are 140 Movano bespoke platform cab vans, from Vauxhall.
All are powered by Vauxhall's frugal 2.3-litre 125bhp engine and have been specified from the factory with the L3 long wheelbase to accommodate the energy provider's equipment requirements.
Specialist bodywork was produced by Vauxhall-approved converter Trucksmith and features a low-floor polycarbonate Luton body, with a single three-dimensional air management system above the cabin for improved aerodynamics and fuel consumption.
This bodystyle, dubbed KneeHi, additionally comes with a high-grip rubber coating to make entry and exit into the vehicle easier and safer for British Gas engineers.
Colin Marriott, general fleet manager at British Gas Centrica, says: "We chose the Movano because it's one of the most fuel-efficient and reliable light commercial vehicles around.
"The environment in which they operate is not only specialised but demanding too, and we needed a vehicle that would carry and accommodate the load without any trouble," he adds.
Ordered on a five-year operating lease to accommodate new business growth, the 140 customised vehicles will be used specifically for the company's growing loft and cavity wall insulation business.