Happened other night, basically the car will not select reverse. Drove home from work the other night and car was fine. Came out about an hour later and no reverse. The stick just will not go in, i can put it in all other gears fine and it drives forward. I get no noise, its not been jumping out of gear, crunching or anything, just no reverse. Had a look and tried doing it manually on the gearbox but it won't have it. I'm stumped got no idea what it could be, any ideas guys?