Moose beat me to the reply !
Just as an addition I received another DVD from them through the post the other day which was cracked upon receipt - no probs though I just sent it back to them in the normal jiffy bag with the stamp on and they sent out the next movie on my list - that's the only snag you need to requeue the movie you couldn't watch.
It's an excellent service and I can't fault them and have more than saved the 15 for the bronze membership.