Halfords roof box. Dimensions approx 125 long X 65 wide X 35 high. Opens from the back. Works with our Thule aero roof bars, but I think it would work with any bars as it attaches with clips fed in from the bottom and secured inside.
Now the battered bit. We had to drill out the lock a few years ago because we left the key at home, so it's secured with a couple of padlocks. They don't rattle as you drive. Looks a bit rubbish though.
There's also a bit of a crack at the front. Still very solid when mounted, but has let in a little water in the past. It could be fixed pretty easily, and contents could be put in bin bags in wet weather.