Mike
I need to make a correction to my post above - I will do that now but just spotted this in the FIA Appendix K
Cars without an international competition history but which have a competition history in national championship events or other significant national events of equivalent status may also be accepted.
I guess the key words in that is "may also be accepted"
also from the FIA Appendix K
If a model has not taken part in period in international races, HTPs of corresponding cars must be submitted to the HMSC supported by evidence from the relevant ASN that the model has a history in period of competition in events of national significance.