There are two bands with this name:
These are photos from concerts where Warm Jets played, so they may be of other bands that played the concert as well.
Warm Jets / Blur / Super Furry Animals Dec 9, 1997 London, England, United Kingdom Uploaded by Chris Dix
Reading Festival 1997 Aug 22 - 24, 1997 Reading, England, United Kingdom Uploaded by Gwyn Williams