There is an acknowledgement on their website that with the new reporting system, data will be delayed. No mention of how long though.
Estimated release dates
With the launch of AvStats, the system that processes airport and airline data, there is a delay to the release of published reports. We will update this page as soon as further information is available.
Data Month Date Available On Website
https://www.caa.co.uk/Data-and-analy...-airport-data/