I found out in August that I'd been on a frozen increment for 2 years for no good reason. Got it sorted, expected to see the backpay of £2000 this month! Yay!
Out of £2000, £800 had gone in tax, which I'd steeled myself against. What I hadn't thought about was that, apparently, the PAYE rules changed in September and another £550 went to that. so, out of £2000, I saw about £600. Hoo-rah!
I've got iSupport (Do Apple know about this?) looking into in as the pay owed (and PAYE handed over) would, ordinarily, have been paid before the PAYE rule-change, therefore I argue that I shouldn't have to suffer. We'll see; I haven't ordered the Aston just yet!