What do all the buttons do on an F1 steering wheel?

Ever see a Formula One steering wheel and wonder what the hell all those buttons are for?

Well in the above video Lewis Hamilton gives a 'steering wheel masterclass' with an in-depth look at how he drives his Mercedes Formula One car.

As Lewis explains there are amazing 26 buttons and switches that he is in control of out on the track.

Kind of makes Formula One looks like the world's most complex computer game really – doesn't it?