And who are you?

As a sort of follow-up to yesterday's post. it seems in certain districts you won't be able to vote today without producing some form of ID - presumably photo, or what's the point?.  This is on a test basis, but clearly the intention is that this will become the norm.  So what options do you have?  It won't affect me, but going through my belongings, I have (1) passport - although it's expired, so would that be acceptable? (2) driving licence and (3) pensioner's bus pass.  Other than that, I would be hard pressed to prove my identity.  It will be interesting to see how this pans out.