Thank you for all taking the time to read this thread and to share your research - I sincerely hope that the profile of this condition is being raised and every breeder who was not aware of Hip Dysplasia will now ensure they discuss it with their vet before any future breeding is planned. You may also be interested to read about a HD Health Programme which is underway:

PawPeds

Again this highlights the condition, brings awareness that HD is a hereditary defect in cats and more importantly confirms the test that breeding cats should have.

Please do not ignore this test if you are a breeder (especially of BSH cats). Whatever the percentages state I can confirm this is a truly awful condition and not as uncommon as people think and the profile must continue to be raised through all possible avenues. Talk to your vet, add it to your next cat breeding meeting agenda and note on your websites that you test for HD in your breeding line.

Keep posting your research!