It's hard to define what a luxury car is, but most will agree that it comes down to a combination of quality interior materials, refinement, on-board equipment, ride comfort and, of course, a huge price tag.

So which luxury cars are the best ones to buy? It can be a hard one to work out, but luckily we will hear from Auto Express today. They have tested and driven all the latest models and can give a helping hand. We've run through the top models on the market to put together the official top ten.

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1. Mercedes S Class

Mercedes’ technology-crammed flagship is one of the most advanced motorcars you can buy and luxury comes as standard.

There are fewer relaxing experiences than driving the Mercedes S-Class. Vibrations through the pedals and steering wheel are non-existent, and even at motorway speeds you won’t hear any wind or tyre roar.

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