When I was in England I discovered that the Christian religion forbids taking pictures inside of churches. There is, however, dispensation given for the purpose of selling postcards. Here's a little tour I took of churches in London and Cambridge:
I'm putting them in order of when I saw them, not when they were built. Westminster Abbey (above) was built about 500 years before Westminster Cathedral (below), which was done in what is known as the "retro cathedral" style.
Then there's St. Paul's, in what architects call the "big" style, followed by King's College, which was contemporary when it was done, as was the last church, Our Lady of Geogia O'Keefe (interestingly enough, not in England).