For future reference in case anyone searched for alcantara supplier, the official UK importer can be found at
http://www.ukhide.co.uk or on eBay as seller ukhide.
They sell by the metre length (1.4m width) at around £77 per metre. From the swatches I have received from them the Clio 182 interior
appears to be colour code 9052 - it is a very close match
but not absolutely exact (unless my car interior has faded somewhat, which would explain the slight difference). You need the non backed Alcantara for door cards etc, and backed for the seats. The spotted seat section from the standard 182 seats are from the Starlight range, again code 9052.
I can tell you the colour is not codes 9002 (dark grey), 9040 (jet black), or 9980 (dark blue).