I bought my copy of the BBCs 67 radio version yesterday and listened to it last night, I enjoyed it although I think the dramatic music was over done and sounded like something more suitable for Charles Chilton's classic Sci/Fi radio series 'Journey Into Space' which was broadcast back in the 50s.
Peter Sallis' performance as the Parson was great and if I had been John Nicholson (The lead character) I would have killed the Parson much sooner
As 'morrisvan' has already pointed out The Thunder Child battle is absent and replaced with an air battle in which some jets are shot down with the Heat-Ray, but it doesn't have the drama of Wells' Thunder Child scene.
I did notice some changes in the radio drama that didn't appear in Wells' original novel but did appear in Jeff Wayne's Musical Version, such as the use of a Parson instead of a Curate, I reckon Jeff must have heard this radio version before starting his musical.
PS. the cover picture on the CD box is naff
but on the whole, this dramatisation is well worth £15.99