These are the dates they've previously paid interest on according to the statements
29 Feb 2008 INT
31 Mar 2008 INT
30 Apr 2008 INT
30 May 2008 INT
30 Jun 2008 INT
The 31 July payment doesn't seem to be there yet.
My First Active eSavings account doesn't have the July 31st payment either.
FA and UB are both part of the RBOS Group and their systems look identical except for branding.
As far as I remember the payments don't show up until the first day of the next month even though they have a transaction date of the last day of the previous month.