Just wanted to say I looked a bit into this.

Unfortunately the results are not promising: The UK DVDs are also handled by Warner, so they probably also have the changed ending narration.

It seems like the only way to see this movie on DVD with the originl "so ends the first part..." ending is to takethe audio from a VHS tape and splice it. I have both the R1 DVD and a VHS Tape that contains the original audio. Unfortunately I don't have the hardware or technical knowhow to do the splicing. I'd be willing to send both though to someone who would like to do it.