Transsexuals who have yet to have a sex-change operation will be entitled to two ID cards, Home Office Minister Lady Scotland of Asthal has said.
One would be in their gender at birth and the other in their legally-acquired "gender of designation".
It doesn't make clear whether this is as a "side-effect" of the proposed legislation, or a "feature" that the Lords have introduced. Alas, I haven't the time to check Hansard on it ("peer review", a-harr), so consider this a "bookmark for later" post.
The idea of what constitutes a unique "identity" is certainly a fascinating one...