Well, after a bit of investigation, I now know why!
I had found out it was only reproducable until midnight last night
and now when I print more debugging information I can see why!

[lcuk] val: 1301095962 25/03/11 23:32:42 March 25
[lcuk] val: 1301182362 26/03/11 23:32:42 March 26
[lcuk] val: 1301268762 28/03/11 00:32:42 March 28
[lcuk] val: 1301355162 29/03/11 00:32:42 March 29
[lcuk] val: 1301441562 30/03/11 00:32:42 March 30

Fix forthcoming in the morning
/me gives himself a sarcastic pat on the back as everyone on irc and twitter has been doing