Wouldn't usually post things like this but they look quite good: http://www.rackinabag.co.uk/
You may not agree, but this is unsual for a mass dvd company to have on their front page!!!!!!!!!!!!!!!! Two sizes available: X Rack 800 Soft Roof Rack is £34.96.
Tough, soft polypropylene blanket with integral non-scratch and anti-slip bottom protects vulnerable paintwork.
Two/Four high density foam runners feed through slots in the blanket and cushion loads up to 35kg in weight.
Additional slots in the blanket allow the runners to be adjusted to suit different size loads.
Strong straps secure the blanket and runners to the four corners of car in an 'X' pattern.
27 anchor points for solid fixing of long, short or bulky medium weight loads..
Size its is always with you in the boot
Solid Fix 100% secure, no slip or slide
Fit it in 2 minutes
Universal fits most cars
Made with soft materials protects the car