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@hugo7
Right so I've spent a while playing with the throttle twist grip.
I trimmed the crumpled plastic bit with a sharp knife. Then I took it apart (amazes me how simple some of the stuff is on motorbikes).
I've come to the conclusion that I think the bars are bent, which is making the fixed position of the box holding the throttle cable that the twist grip sits in not rotate back cleanly. I tried bending the bars, but to no avail. I managed to get it almost flicking back when things were apart but as soon as I put it back and tightened, it all go stuck again.
Hopefully you can see here and here...
http://i926.photobucket.com/albums/ad106/hugo7_photos/Mobile%20Uploads/2014-03/4B021EFD-3740-4BB7-92E5-294AF57B6D41_zpsqsdihhs0.jpg
http://i926.photobucket.com/albums/ad106/hugo7_photos/Mobile%20Uploads/2014-03/throttlestuck1_zps135d071d.jpg
...as the twist grip is rotating it's rubbing on the inside where the arrow is. I assume this is happening most of the way round the inside. As the body is metal I can't trim it that easily and I don't think there's enough plastic on the section that holds the cable to safely trim.
You can also kinda see on from the backside that it's not sitting properly.
http://i926.photobucket.com/albums/ad106/hugo7_photos/Mobile%20Uploads/2014-03/53175E51-6523-4C63-8A63-C56776184684_zpsc7jlpiwe.jpg
Re buying new bars, I'm guessing it's the same as bicycles. Clamp diameter, grip diameter need to be the same. Rise and length are optional, but it's best to stick with the same. I'm going to assume ebay's my best best.
This might sound stupid but do all bars have a little hole for the starter motor, twist grips etc. to slot into?