I recently bought a pair of these
[url= http://www.screwfix.com/prods/95382/Workwear-PPE/Protective-Clothing/Eye-Protection/Bolle-Clear-Lens-Safety-Specs ]Bolle Specs[/url]
To use while riding a Harley in the States and have been very impressed by them, so much so I will use them for cycling too.
Although they are stated as clear they are very lightly smoked, ideal for lots of weather conditions.
[url= http://cgi.ebay.co.uk/Bolle-Contour-Safety-Specs-Glasses-Clear-Lens-FREE-BAG-/130496335393?pt=UK_SportingGoods_SportsSunglasses_SM&hash=item1e62300e21#ht_1417wt_1139 ]Cheaper[/url]
I've got a pair of the clear and a pair of the yellow-tinted one & been using them for a year. Excellent quality for the price.
there are a few places doing them on ebay. Very good glasses. I've got several pairs. Clear, slight tint (esp?) and full sunnies.