you have to fill ONLINE APPLICATION FORM which is quite long and requires alot of details
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Moreover, you have to book confirmed ticket copy and email confirmation (copy) of a hotel in advance or to provide them complete address where you will be living and with whom. They will ask for ur Bank's SALARY STATEMENT (6 months) & SALARY LETTER from ur employer. Original passport having atleast 3 or 6 months (not sure)validity from its expiry date.
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Its very easy to get VISIT VISA if ur living in Qatar for more than 1 year atleast will be beneficial for u and if ur born in Qatar then 100% success chance
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Anyhow, still see their site for fresh information on HOW TO GET VISIT VISA of U.K.???
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Good luck and enjoy U.K. as i did alot with my wife