I think you're talking about the DVD here. On the R2 release, there's an option to play the film with the Walton score as opposed to the Ron Goodwin version. As a side note, only one track of the Walton score was used in the released film (Battle in the Air).
Years ago, there was a CD released that contained both scores. That orginal soundtrack is somewhat rare. It took me bloody ages to get it!
Spudgun