Some knowledge of the English language is appreciated (I tick this box as well)
Sure, if your name is Borat!
On a serious point, as Coffeeking said, you can’t. Maybe you can hide a year here or there, or rather you don’t differentiate between the months, just the years, but you can’t hide 6 years without it being completely duplicitous and therefore grounds for instant dismissal should/when the truth comes out.
Best advice I can give is not to send your CV in the first instance, but rather ring and speak to the person looking to make the hire. DO your research on them as an individual (LinkedIn, general Google etc) and as a company – http://www.ft.com or similar – then call them and try to build some rapport with them. Explain who you are, that you’re very inerested in the position and that you wanted the opporutnity to bring yourself to their attention and discuss the position before you sent your CV in formally.
If you do this, you will get the chance to position your 6 years of brain boxing and mitigate the idea that you might be over qualified.