http://www.rootschat.com/forum/index.php/topic,163880.msg767586.html#msg767586- was this not the right one? Percy N Jex m. Ivy B Gore, 1928?
And if you look at the full BMD images of 1978 deaths on Ancestry you can quite quickly find, in the second quarter (remember to check all four quarters for each year):
Percy Norton Jex, b. 8 Aug 1895, d. Blyth district, Vol 20, p. 2028 (Apr/May/June 1978)
Ivy B. Gore might be the one listed on the post-1983 deaths:
Ivy Belmont Jex, b. 25 Feb 1900, d. Feb 1994, aged 93, district Luton.
One of the possible children listed in that other message:
Kenneth Fotherington Jex, b. 11 Jan 1932, d. Jan 1998, aged 56, Great Yarmouth, Yorkshire.