I have found online from Glyn Hopkins a price for individual Illumination options;
Doorstep Garnishes PN: 08E12-TZA-600 - £309
Centre Console PN: 08E11-TZA-600 - £183
Door Lining Illumination PN: 08E20-TZA-600 - £233
White Front Ambient Footlight PN: 08E10-TZA-600 - £146.20
Total £871.20
Also found a January 2021 Accessories brochure with the total pack quoted as £875, if bought individually they would total £1080!!
Looks like my dealer offer of £100 off could be regarded as generous for the total pack.