It's 12.28pm on a Monday.
This index is available from Monday to Saturday 7:00am to 12 Midnight UK Time.
Since when have computers not worked on bank holidays? grrrr.
Update: A closer read of the website reveals :
The WebCHeck service will be closed for the bank holiday on Friday 18th and Monday 21st April.
Normal service will resume at 7.00am on Tuesday 22nd.
So it appears I'm right, computers don't do bank holidays, how silly. They'll be starting a trade union soon...