Well, I made a right dipstick out of myself yesterday. I went down to let Jason look again at the wheel nuts and even though I'd emailed the shot you sent Iain, I took a print of it down just so we had a reference to hand.
So Jason takes off the wheels and I'm pushing that photo into his face saying "but look, they should be inside, not sticking out like that!"
Cool as a cucumber he says, "those are of a rear wheel". I say, "don't be daft Jason, Iain knows I'm a dimwit and don't know what I'm talking about, he wouldn't give me duff info as these blokes on the site are not like that."
So, off comes a rear wheel and lo and behold it's the same as your photo.
Cue embarrassed silence and tumbleweed blowing across his garage floor.

Because I skived off most of yesterday afternoon I didn't see any of the posts above so seeing them now has made everything crystal clear. We don't know why the metal thing is a bit longer than yours but Jason took off the nuts and had a good poke around. There's no spacers or anything out of place, the nuts are super tight, nothing's damaged or running wonky so perhaps I've just got some Malaysian market anomaly there. The good thing is that he walloped out the crap old off-target peening and then peened the nuts properly.
Here's the passenger side one he redid.

Anyway, it's all good and thanks for letting me know about peening. I'm now all peened up and ready to go. Thanks to you both for all the help.
