everything iva you need to know is here
http://http://www.businesslink.gov.u...ion_Manual.pdf
its long winded but you need to have this informaton to build a car to pass an iva.
the cat bits are under section 02b there will be no "exact match" cases for almost all kitcars and there is a note about "effective dates" of amatuer built cars you need to pay attension to