theres a seller on ebay called FURIOUSBM, up near bradford i think. he makes safety devices style racks to order for between 300-370 depending on what style you want. Just put discovery roof rack in the search box and it should bring up the adverts.
new to this site but not new to Landies, really got the bug now and dont think ill ever change from the brand. Ive got quite used to the odd oil spots on the drive:D