Before Spinal Tap there was... BAD NEWS, a joke NWOBHM band from the minds of several of the folks from cult British TV comedy "The Young Ones." That should be enough to send most people scrambling feverishly onto Youtube searching for any scraps of footage they can cram in their eye- and earholes. There were two episodes of BBC series "Comic Strip" devoted to the band, who basically sound like Motorhead with a lobotomy (i.e., I actually kind of like their songs even though they're supposed to suck), one in 1983 and another in 1988. They recorded an album with Brian May and played a bunch of gigs during their lifetime, including a date at Donington from which footage for their second "Comic Strip" appearance was culled.
I don't know if I can say Bad News is funnier than Spinal Tap (though I guess the first Bad News show was broadcast before Tap hit theaters if that counts for anything), but there's really no way out of comparing the two "bands." I will go on record that this is some hilarious stuff that the Archers' Guild nation better get into quick.
PS: Youtube won't let me post the original "Comic Strip" show on here, but it's on the site if you wanna have a laff.