So, after a bit more searching I found a price list on the Listers website here:
https://listers.co.uk/new/cars/skoda/elroq?f=search:true
Looks like:
Starting price is £31,500, for a 50 SE, with only 232 miles of range
Next up is £33,350 for a 60 SE L with 260 miles of range
If Listers are correct they are the only SE and SE L models, which seems odd, but I find Skoda's model naming so unfathomable at times that I'm not saying Listers made a mistake...
60 Edition is £34,450
60 Sportline is £37,400
85 Edition is £38,650 - this is the starting price if you want over 300 miles of range (360 quoted)
85 Sportline is £41,600
Plus packs are £1,950 - only available on Edition so I assume the Sportline trim includes whatever is in there
Advanced packs are £4,150 on Edition and £2,250 on Sportline - the difference being £1,900
Maxx packs are £5,100 on Edition and £3,200 on Sportline - difference as above.
So those Sportline prices above don't tell the whole story. There are cheaper Elroq prices to be had, although the bigger battery models with a decent range still seem pricey to me.
With extras the Listers prices look a few hundred cheaper than the Autotrader one, but not vastly different.