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That's a great shout from above.. the paint markings match (missed your post Tony). So I've replaced the cup spring with a non-cup spring. Brilliant. Just as well I've got an uprated set on the way :)
I don't really like the sound of "removable harness bar". I'd like to think it would be solid since I'm entrusting my life to it.
Edit: also, you can get a full bolt-in cage for not a lot more than that. Worth considering.
You only need a socket set (around £80 from Halfords for a decent one) and Spring compressors (£20 off ebay). Once you've got the tools you'll be able to do loads of other simple jobs and save yourself a stash.
If it's grey/dark smoke and you particular notice it when you put your toe down, I'd be very inclined to say EGR valve. Should be a relatively easy job to do yourself, if it's accessible.