Thanks for that. Presumably the basic chord structure for HTA came from Jarvis then. To paraphrase, the Jarvis "wanting to get a song about aging & death into the charts" would bear out that he'd be the main writer of that song.
Wonder if the Cocaine Socialism guitar part'll ever surface? I'm guessing it's not the part on 'propper version' if he kept hold of it when he left.
That's cleared that up for me then. Ta!

This is quite amusing: tomorrow nite I intend to cover Help The Aged live......accompanied by a violinist!
(I'm jokingly dedicating it to myself as it was my birthday on Tuesday.)

This interview from Mark explains a bit about his contribution - as with every member it varies from song to song, but it'd seem safe to say that from Different Class onwards (and even slightly before according to the interview!) he will have contributed guitar/keyboard parts, solos, maybe some chord sequences and stuff, as well as just playing bits that other band members have come up with. And Nick confirms that his droney E-bow guitar stuff was a factor in the new sound they developed circa This Is Hardcore.

Obviously any band member's contribution would vary massively from song to song (eg A Little Soul was apparently almost a Jarvis solo effort, with the others coming in to play some little bits when the track was almost finished), and the way that Pulp tended to write songs via interminable jam sessions where bits get grafted on and whittled away means it's not always easy to say who was responsible for what bit. However, as the fact he was contributing to the writing was a reason that Mark was asked to become an official member, it's safe to assume that he had as much to do with the music you hear on the records as Candida, Steve or Nick.