Wheniwasyourage
I want to buy some too, although I don't actually need any, so won't really buy some. However, I keep looking in M&S, where I have bought some nice ones before, but the packs of 5 all seem to be either pink or lacy (neither of which I like) or various shades of yuck. And that's before you even start sorting out the thongs from the full-sized bloomers and everything in between. Why don't they still do cheerful colours with patterns or flowers?
Sorry, OP, that is of no use in your search for suggestions 
They do actually. Look in multipack midi or shorts section, I was just looking now.
Online go for Sloggi on amazon, more expensive, but top brand.
And TU online have exactly what you want. I'm just frustrated by the way the 12's sell out quickly in the Sainsbugs shops but they have several packs which are exactly what you want. BTW, TU size big - their 12 is everyone else's 14's.