After the frosty weather a couple of days ago, I ordered some hand guards to keep the wind off. They came last night and fit a treat. Don't stick out like a sore thumb either.
Enough clearance on full lock so no worries there.
They're only cheap Chinese eBay jobbies so if they don't work I've only lost £20, but they seem to do the job ok.
The only obvious downside being the brake lever mounting bolt. It's only just long enough on its own, and putting the bracket in place meant I couldn't get the nut on fully. Not wanting to risk it vibrating loose and the lever falling off, I replaced it with a longer bolt. This meant the shoulder was smaller, making the lever a tad loose, but it'll stay on until I can get a replacement turned to size at work.