Seems a simple enough question, with a simple enough answer.
Today, sunrise in the UK was officially 06:00 and sunset will be 20:29. Last evening it was a fraction later for the sunset, of course but I looked out of the window and it was not dark in the least, nor did it seem twilight. It was still day. What I call sunset would have been 09:10, i.e. when it was no longer possible to see clearly without artificial light.