Charge exchange spectroscopy has long been a key diagnostic tool for fusion plasmas and is well developed in devices with Carbon Plasma-Facing Components. Operation with the ITER-like wall at JET has resulted in changes to the spectrum in the region of the CVI8-7 charge exchange line at 529.06nm and demonstrates the need to revise the core charge exchange analysis for this line. An investigation has been made of the CVI8-7 spectral region in different plasma conditions and the revised description of the spectral lines to be included in the analysis is presented.