as a bonafide resident of essex im not sre where youve got the country thing from. go a little beyond to suffolk / norfolk and sure, thats getting pretty damn rural in places but essex is really just suburban london to be honest.
anyway that aside shizzle to do when youre kicking about london other than bumbling along oxford street and tottenham court road at a snails pace irritating the locals:
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tate gallary: on southbank (huge free modern art gallery
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globe theatre: shakespears old digs and its not far from the tate
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covent garden: near soho, lots of street performers, bars, restaurants, genuinely funky shops. that doesnt make it sound very cool but trust me its ace - a great place to take dates.
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soho: more a place to have a wander around in the evening. lots of very 'trendy' bars, restaurants shops, record shops, book shops - tis where the young hang out. also a lot of gay bars and strip clubs around there so something for everyone! also conveniently where my office is located

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st pauls: home of the church of england, royal family marriages, christenings and funerals, lots of graves, mad art, memorials and things.
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speakers corner: located in hyde park which is the big park in london where individuals stand and give lectures on usuall quite random topics. sometimes insight, sometimes very close to the bone or outright bigotted but always entertaining. anyone can go there and talk about anything they want so its definitely something to see.
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british museum: not the one with the dinosaurs, this ones about human history and culture - not just british, its full of stuff from ancient egypt, south american and that - mummies and shrunken heads - you cant go wrong!
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houses of parliament: home of british politics and more recently expenses scandals. its possible to book a tour but it can be kinda tricky to arrange because the place is actively in use.
if its a nice evening just have a wander down southbank to the london eye. theres a load of nice bars / resturants you can chill out in all the way along there, some flea markets, second hand book stalls, a mad bit that skaters use but all quite safe al the way along. theres the namco center along there just past the london eye if you want to get your geek on

when you get around to doing the essex thing have a think about checking out a place called hampton court. youre not going to be too impressed with the 'home of blur' frankly i can safely say as a resident but if you want to see some old school english manor house type thing hamptons the way to go.
anyway, that should give you a few cooler options than just browsing john lewis and selfidges, or wandering aimlessly around leceister square where is absolutely nothing to see. if you want any more details on the bits above or want to hook up for a bevvie while your over give us a toot.