Not that it's a HUGE savings, but we were in our local Costco today and noticed that they haven't raised the prices on their first and second class stamps. Since they've all gone up at the post office and through royal mail's website, might be a good deal for someone!!
I think they've gone up 3 or 4 pence per stamp since 1st april. Worth having a check. Not sure if this is all costcos or when they'll catch on or change it.