Got one of these for sale. Fits most cars, but not my van. £20 to ukB customers.
http://www.towsure.com/product/420-High_Rise_Strap-On_3-Cycle_CarrierThree bike capacity carrier. Allows cycles to be carried without obscuring the vehicle's road lights and number plate. No lighting board is required. Attaches to the rear of the vehicle using four heavy duty straps (included) Protective sleeves are also included.