I noticed you asked about colour in a few places. I'm just going to attempt to answer it here along with your other questions.
NB: Only mentioning the following eBay link is just for contained details. I have no connection to it, just something I found whilst digging for info.
Archive.org seemed pretty useless in terms of trying to get an answer from the official abarthcars.co.uk site.
Far more information, including some prices, is available from the original 24 Jul 2008 press release. The details of the specs are also in another thread which you seem to have already found. These details and prices may have changed at some point. The UK had a temporary drop in VAT from 17.5% to 15% from December 2008 for a while. There are two "optional" paints listed, metallic £375 and special £250, but it doesn't list what they are, so we need to find a brochure...
https://www.media.stellantis.com/uk-en/abarth/press/abarth-roars-back-to-the-uk-press-packhttps://www.abarthforum.co.uk/grande-punto-abarth/grande-punto-abarth-standard-specifications-and-options/msg965408/#msg965408There's currently a brochure for sale on eBay listed as December 2008, there are others on there but this one seems to have the clearest pictures. It doens't have any prices attached but does show the three colour options: 1949 White, Scorpion Black (Metallic) and Speed Red (Special). It might be worth saving the images somewhere in case you want to check something else later on.
https://www.ebay.co.uk/itm/Fiat-Abarth-Grande-Punto-Sales-Brochure-Poster-December-2008/313480848021?hash=item48fcea2295:g:-RgAAOSwaF1gT1d5Punto's specifications aren't my specialty, never had one, so my knowledge of what changed and when isn't as good as it is for the 500/595 as I've had 3 and specced several others. I don't know if there were other colours introduced or if the standard colour changed but I'd guess as yours is early the above is probably correct. From the above you should also be able to work out what you have in terms of optional extras. I don't know of a way to find build sheets to see if any were fitted after point of sale though.
What changed in the brochures between Oct (
https://www.ebay.co.uk/itm/Fiat-Grande-Punto-Abarth-2008-10-UK-Market-Foldout-Sales-Brochure/174651742548?hash=item28aa0e1954:g:v50AAOSwnGJWSiIy) and Dec 2008 linked above I can't make out as some of it is missing. It might just be spelling/grammer change or be tied to the VAT change for all I know. It may be a change to standard equipment, although I doubt that so early in the cars lifetime.
As to how many are there, I'm seeing a total of 377 licensed via the following site, by adding up totals from New Registations tab. How accurate that is, I have no idea.
https://www.howmanyleft.co.uk/vehicle/abarth_grande_punto_155_bhpThis one is also listed but is just one random car, only registered once.
https://www.howmanyleft.co.uk/vehicle/abarth_grande_punto
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