I published the below post today in the Aviation Industry forum but because not everyone reads this forum I've copied it to selected airport forums.
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Still no April stats releases so it's no use expecting May's yet. The CAA has now put this message on its website.
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.
No indication when April's stats will be out, let alone May's. Yet another example of an organisation introducing a new IT system that clearly was not tested properly.
Addendum
There is considerable discussion about this on another website.
One suggestion is that the airports now provide figures to a third party that verifies them before they are published by the CAA. This is due to a new EU edict (yes, I know but I can't verify that this is true) and leads to airports being fined if the figures are not produced in a certain way.
Another suggestion is that figures are fed to an automated system that verifies them against a CAA-held data base. It is alleged that the CAA systems are incompatible with accepting the figures from the automated reader and, anyway, because so many of the criteria held in the CAA data base are either wrong or incomplete airports are continually being told their figures cannot be correct although they may well be.
It appears matters were much more efficient when people sat down with calculators, pens and pieces of paper.