HMRC is adamant that the system now works; anecdotally, lots still fall through the cracks. Keep a beady eye on Mrs Noise's tax codes, make sure that you have a watertight audit trail in the event of making a case against them. It makes it much easier to get your money back if you have told them time, time and time again that you volunteer the right information at every turn.
I'm seeing my accountant this morning, HMRC owes me just under £800 and has done for nearly a year. I can't claim compensation because I have not suffered actual financial loss (bizarre, I know) unless my accountant does the work and invoices me. It's ok though - you only have cause to worry this month and be under the spotlight if you like nags.
HMRC turns attention to horsebox owners in evasion clampdown - 06 Jan 2015 - Accountancy Age