Bit of a round-up, so apologies for any continuity errors.
To drown out the creaking I decided to do something about the stereo. Went for a modern (but middle-school looking) blaupunkt and some tweeters inside a pair of premium sound tweeter pods. Thanks @Rob HB1! Keeping the original kick-panel and parcel shelf speakers for now - I want to get the premium rear speakers in too, but need a better condition parcel shelf to house them.
A couple more appearance things - popped on a mtech 1 steering wheel (cheers @Contrails) , and got it tinted to make it bearable for the two year old who faces directly out the rear window.
The tint was about 20 years too late to save the poor sunfried interior, so I replaced it with a lovely set from an SE courtesy of @BMTHUG
I replaced the lollipop bushes (as they were polyurethane) in the hopes of curing the creaking, but it wasn't til my swaybar bushes finally arrived via the dealership that I finally achieved blissful silence. Not surprised they were complaining - they were pretty munted.