This building is No. 1 Croydon (formerly known as the NLA Tower), a 24 storey office block next to East Croydon station. Richard Seifert and partners were the architects who designed the building, and they were also responsible for London's Tower 42, Euston Station and Centre Point.
There are some interesting clouds in the sky. It is coincidental, but similar clouds appeared on the previous occasion that I photographed this building for the 365 Project: https://365project.org/rumpelstiltskin/365/2017-02-16
