For what it's worth, I forgot to replace the 1_2_1 by .* in the watch file. The corrected watch file is attached.
version=3 #ftp://ftp.jclark.com/pub/jade/jade-(.*)\.tar\.gz debian uupdate opts=uversionmangle=s/_/./g \ ftp://ftp.jclark.com/pub/jade/jadew(.*)\.zip debian uupdate
