Either or

Newsnight is moving back to 2230 on BBC from 21st June, for the first time since April last year. 

At the height of the pandemic, with |News trying to minimise the number of staff in Broadcasting House, Newsnight moved into the main newsroom studio directly after the Ten O'Clock News. A few lights were dimmed, some sheer blinds pulled, and a few purple bulbs switched on. At the start of October, Newsnight moved into loft accommodation in Egton House, shared with the BBC Persian Service.  

Now, as lockdown eases, it seems BBC News has decided that the investment in separate studios for Newsnight is worth it, and, one presumes, there is some audience advantage in the earlier start time, rather than seeing the show as a complement to the main BBC1 bulletin. Newsnight also came from a new set in Pacific Quay last week, and that's likely to be a continuing commitment, as part of Tim Davie's "Across the UK" drive.