From the Horses mouth:
DIAMOND COMIC DISTRIBUTORS
Please note that due to a problem with our regular weekly shipment, several titles will be missing from your deliveries next week.
The titles listed below will now have a new UK on sale date of Wednesday October 2nd 2013.
UNCANNY AVENGERS #12
UNCANNY AVENGERS #12 CASTELLANI LEGO VAR
UNCANNY AVENGERS #12 CASTELLANI SKETCH VAR
A PLUS X #12
SCARLET SPIDER #22
PUNISHER TRIAL OF PUNISHER #1 (OF 2)
MARVEL UNIVERSE ULTIMATE SPIDER-MAN #18
WOLVERINE IN FLESH #1 2ND PTG SEELEY VAR
WHAT IF AVX TP
DARK TOWER GUNSLINGER TP LAST SHOTS
Diamond would like to apologise for any inconvenience that this may cause.
Diamond Comic Distributors