Last week several government databases decided I was living in Leeds again. Whilst I like Leeds, I'd quite like my post to end up in the same building that I'm living in. A few phone calls into the problem and the finger looks to be pointing at either the National Insurance Contributions Office or HMRC. I can't get through to NICO because all their lines are busy. As usual. However, as another department kindly sent me a letter saying they'd been in touch with HMRC about my tax code several days before things started going wrong, this is where I pick up the trail.