You can't see the problem with zdump, as the transition is not visible to it. But in Europe/London, there was a transition on 1996-01-01 00:00:00. Here's my dump of the zoneinfo file for the transition & one row either side of it...

Here's what I get at elsie; note that the 1995/1996 leap second transition does seem to be visible to zdump. --ado Script started on Tue 13 Jun 2006 01:12:41 PM EDT elsie$ cd ~/src/tz elsie$ make install TOPDIR=$PWD/tmp REDO=right_only >&- elsie$ ./zdump -v Europe/London | grep 199[56] Europe/London Sun Mar 26 00:59:59 1995 UTC = Sun Mar 26 00:59:59 1995 GMT isdst=0 Europe/London Sun Mar 26 01:00:00 1995 UTC = Sun Mar 26 02:00:00 1995 BST isdst=1 Europe/London Sun Oct 22 00:59:59 1995 UTC = Sun Oct 22 01:59:59 1995 BST isdst=1 Europe/London Sun Oct 22 01:00:00 1995 UTC = Sun Oct 22 01:00:00 1995 GMT isdst=0 Europe/London Sun Dec 31 23:59:60 1995 UTC = Sun Dec 31 23:59:60 1995 GMT isdst=0 Europe/London Mon Jan 1 00:00:00 1996 UTC = Mon Jan 1 00:00:00 1996 GMT isdst=0 Europe/London Sun Mar 31 00:59:59 1996 UTC = Sun Mar 31 00:59:59 1996 GMT isdst=0 Europe/London Sun Mar 31 01:00:00 1996 UTC = Sun Mar 31 02:00:00 1996 BST isdst=1 Europe/London Sun Oct 27 00:59:59 1996 UTC = Sun Oct 27 01:59:59 1996 BST isdst=1 Europe/London Sun Oct 27 01:00:00 1996 UTC = Sun Oct 27 01:00:00 1996 GMT isdst=0 elsie$ exit script done on Tue 13 Jun 2006 01:13:11 PM EDT