.....And so, eventually, we arrive at the door of the Lexus LS600h. In many ways, it is even more forgettable than the Phaeton. You could easily buy one and get home to find you already have one in the garage. But the toys - wow! It'll even self park, if you have a month or two to read the instruction book. And you're young enough to understand it - i.e. you're 12.

It is also extremely quiet, fast and by all accounts, built to an even higher standard than the Mercedes. But the best thing is that little "h". This means that buried deep in the car's underbelly, it has a hybrid drive system.

You don't know it's there. It never makes itself felt. But it means you can sail right past Uncle Ken's congestion cameras without bothering to pay. And that is taking the ****.

No really. There's something sanctimonious about a hybrid Prius which you buy exclusively to show the world that you're, like, 'green', man. But with the Lexus, you are buying a large luxury saloon that chews fuel and consumes whole housing estates when you turn it on. Not paying the congestion charge is a side effect.

In other words, you're playing the system. Beating bullies at their own game. It's not perfect, but it did something that's rare in the world of luxury saloons. It brought a smile to my face.

The LS600hL is the only car above 250 horses that doesn't get the tax. And it has 440 horses. Clarkson should know that.