What it means: how long people waited between booking a GP appointment and having it, across all GP appointments in England. It covers appointments that were booked, so it cannot show people who tried and failed to get one. Some appointments are booked well ahead on purpose, such as reviews. The solid line is within two weeks, the fainter line the same day. A change of one point or more counts.

Source: NHS England, appointments in general practice (official statistics in development).