We have to be careful about that HSMP ruling. UKBA got their hand slapped and then was forced to make a concession in implimentation. They are ensuring that the reasons they got slapped do not occur again. This is not by making transistional concessions, but by writing the applications in such a way as to ensure that no transistional concession is expected.
Also, there was a Ancestry ruling recently that in part undermines the HSMP ruling.
UKBA does not like transistional concessions, never has, and will actively fight to not have them in most cases.