I was pretty sure the band was Silver... the song goes... "We've gat a wham bam shang-a-lang and a sha-la-la-la-la thing.."

You already know!:p

The song is by "Silver," and the title is WHAM BAM SHANG-A-LANG

Here's a link to all its lyrics:

Silver - Wham Bam Shang-a-lang LYRICS