I find it hard to see how Private Fuel is such a bargain now, especially in a 1.4.

The BiK charge on fuel is £14,400 x the tax rate from the car's CO2 x your highest tax rate.

So if the Corsa 1.4 is taxed at 17%, your free fuel costs:
£14,400 x 17% = £2448 x your tax, say £538 @ 22% or £979 at 40%.

With fuel at 80p/litre and combined mpg at 39mpg, you have to drive 5764 miles or 10489 to break even. And that is for an economical car with low BiK.

I've had all sorts since moving into the fleet market in 1995, and get a new Vectra Elite 3.0 CDTi Estate on 1/8. Currently in a Vectra 2.2 DTi SRi, same before that, Mondeo TDCi, Alfa 147, 2 Volvo S60s, 7 Omegas incl 2.5s and a 3.0, a Vectra 2.0 SRi, Passat estate, Calibra 16v, Cavalier 2.0 CDX, Cavalier 2.5 GLS, and loads before that.

Best of them all were the Volvos.