> 4. The Spice Girls give themselves individual name-checks on Wannabe, prior to this
> when was the last time it was done on a number one record?
Ian Dury and the Blockheads - "I Want To Be Straight" begins with the band members introducing themselves - however, that only got to No. 22, so that doesn't count.
Frankie Goes to Hollywood - "Two Tribes" was No 1 and a couple of the 12" remixes had three of the band members introducing themselves: "My name's Ped, my name's Mark, my name's Nash...", so that may not count either because Holly Johnson and Paul Rutherford didn't introduce themselves.
However, "Float On" by The Floaters which was No 1 in August 1977 begins with the entire band introducing themselves, so I think that's the one: