Ho-kay, little update with a few issues.
Firstly, stupid hands free thing that Halfords so ably fitted doesn't like cold weather, so it turns out. Which is unfortunate considering my current location and time of year.
Secondly, I think the front pads are on the way out. There's been a delightful low pitched grind coming from them in the last fortnight, and I'm guessing that's probably the cause. It was just doing it when the disks were cold, and me being me decided it was probably normal in a car with 0 soundproofing to hear the brakes ever so slightly. But today I noticed that they're pretty much doing it constantly, and I'm fairly certain that the noise level has increased. So I've probably ruined the disks too by now.
Thirdly, no idea what's going on but I can hear a horrid, rather loud, totally different grinding noise from the driver's side of the car when I turn left sometimes. Seems to appear rather randomly - it did it at about 2mph as I was turning onto a road one day, and it's done it since at about 20 when I turned reasonably sharply the other day. And it's done it a number of other times, the details of which I can't quite recall - but all of which while turning left. Doesn't seem to be anything rubbing, and it's fine on full lock basically. It's just every now and again the weird noise appears. I have a feeling it's something suspension related - I might be imagining it, but I think the ride is a little harsher than it should be (even for a Sport). Also the issue seems to replicate most when I have other people in the car, so it seems logical that it'd be the culprit.
Any insight into issues deux et trois?