By way of an update, the Previn CD
finally turned up last night. Impatiently I went straight to Juliet's funeral (the track rather than the event) since that was the critical one.
It
is pretty slow-paced isn't it? - possibly even slower than the recording I've lost, although interestingly the 2 up and down bits (sorry - still a useless description) are still much faster than my original recording, which suggests to me now that they're meant to be fairly snappy. Fortunately it slows down again for the bit I love and I actually applauded after the crucial 2 notes.
So anyway I'm happy. Thanks to all for your help and recommendations.