St. Margaret's Cathedral on Capitol Square is of a negligible size compared with Westminster Cathedral. Colored glass is very beautiful. Built in the 11th century or so, the beautiful exterior has a three-arch porch and a square tower, which unfortunately are rebuilt by future generations.
On the edge of Westminster, the next road is Bigben, and London is full of scenery.
It's a special church. It's worth visiting. It's good.
It's also good not to look at the appearance. If you want to go in and visit at close range, you need to be prepared in line.
It's also one of the more beautiful churches in London, with fewer tourists.