The Pulwiki page of this gig has been updated recently and I clicked on it to see that We Are The Boyz was the opener for this festival appearance! Which to me (and to you) is pretty cool - it's a barnstormer and its live status deserves more than an occasional encore appearance in 1998 and that tease of a performance this year for 6Music.
FEELINGCALLEDLIVE has a bootleg of he Werchter appearance but annoyingly, the first part of the set is missing. Does anyone have the full thing/was it captured? Given the presence of so many downbeat/moody songs from TIH in 1998, this must have felt like a strange anomaly and of course the average festival-goer wouldn't have recognised it and likely never heard it again. I can't see that it was repeated again as the first song in the set, which is a shame.