This year's Dunwich Dynamo takes place on 20-21 July. For the uninitiated it's a 120-mile nighttime romp out of London to the distant North Suffolk coast, through kicking-out time in Epping Forest and on to deserted country lanes. It's a lot of fun.

This year the organisers have collaborated with jersey-meisters milltag to create a special edition DD jersey. "This design takes our standard jersey and gives it a night-time twist: using ultra-bright yellow inks plus a reflective stripe across the underneath of the rear pockets, which also features a special 2013 DD badge", say milltag. Hopefully the weather will be kind enough to allow you to unveil your jersey on the night…

It costs £60 and is available in women's and men's sizes, with all profits from the sale going to DD organisers Southwark Cyclists and national road crash victim charity Roadpeace. You need to hurry though: it's only available for pre-order until Sunday 16 June. This Sunday, then. To see more about the jersey, and to pre-order, click here.