Apple is separating the new smartphones into its usual low-cost versus high-cost categories, with big differences between the two models coming down to the camera, display, and battery life.
iOS 13 & watchOS 6 Now Available
Apple UK Special Event: September 18th 2007
The invitation states "Mum is no longer the word" and invites media to a press conference on Tuesday, September 18th at 10am.
Macworld.co.uk speculates that this could be an announcement for the European iPhone launch or possibly UK iTunes content.
Apple had previously said that they plan on announcing details about the European iPhone launch by the end of this month.