The unreturnable sale goods just feels like the final straw to me. Is this a new high street thing? There's something very unM&S about it - first, that they're so desperate to shift tat the dregs of the sale that they won't have it back under any circs, and second, that the customer's no longer top priority for them. Normally, I'd buy a pile of stuff in the final reductions, maybe return one or two things but keep most of it. This year, I've walked away from lots of things I'd normally have treated myself to, because I hate making £45.99 'now or never' decisions while standing in an overlit, messy jumble sale atmos.
I do love the Rosie lingerie, but find the matching knickers sell out long before the bras whenever there are any decent reductions.