Many people have been buried in Westminster Abbey (formally known as The Collegiate Church of Saint Peter at Westminster). Among these are monarchs/royals, and poets.
For a complete list of who is buried there, try one or both of the following links:
http://en.wikipedia.org/wiki/Category:Burials_at_Westminster_Abbey
http://en.wikipedia.org/wiki/Westminster_Abbey#Buried
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William Wilberforce, Clement Attlee, Charles Darwin, Ben Jonson, David Livingstone,
Isaac Newton, Robert Stepenson, William Pitt and his son William Pitt, Charles Dickens,
George Handel, Laurence Oliver, Robert Browning, Geoffrey Chaucer, John Drydon,
Thomas Hardy, Samuel Johnson, Rudyard Kipling, Edmund Spenser, Alfred Lord Teenyson, Henry Purcell, Ralph Vaughan Williams, Elizabeth the first, Mary Queen of Scots, Rowland Hill, Oliver Cromwell and Admiral Robert Blake were all buried in Westminster Abbey
There are 3000+ people buried in Westminster Abbey.
Newton, Herschel, Darwin, Rutherford, Thomson, Kelvin, P.A.M. Dirac
Sorry, i know this doesn't help, but... Oliver Cromwell was buried when he died, but he was then dug up and hanged from nine in the morning until four in the afternoon, he was then beheaded and his head was stuck on a spike which was then knocked down in a storm it then passed along to many different owners but was finally sold to Cambridge university who put it in a biscuit tin and buried it somewhere in the grounds!
Westminster Abbey
Harold Godwinson