The windscreen extension I purchased from another member (not sure who, perhaps they remember and will remind me) is no longer needed. Denis (from PI) has first option on this, if he doesn't need it, I'll bring it to Wooli.
The extension is a made by
X-creen, similar to the Laminar Lip screen. It seems like a quality bit of kit, made from durable plastic with sturdy fittings and is fully adjustable. It can be mounted by drilling a couple of holes in the existing (ST1100 or ST1300) screens, or it can be firmly clamped on the existing screen (which is how I mounted it).
More info here:
http://www.mra.de/en/x-creenIt was / is effective in reducing the wind noise and buffeting, but I wanted a cleaner look provided by a higher and wider the Bike Quip screen, courtesy of West Aussie Glen.
In the meantime, if anyone is interested, and want their name on a reserve list, post a reply or send me a PM.