[DaveinGermany]

During the trials local authorities decided what was classed as ID, but I would assume at national level (whenever that happens) the government of the day will stipulate what is acceptable.

Five areas have been chosen for the trial What's happening?
Up until now, people only had to walk into a polling station and give their name and address to vote.
But from Thursday, some voters will have to bring a form of ID to prove who they are before they can cast a ballot.
This is to tackle personification fraud - where someone votes while pretending to be someone else.
The five areas affected are Bromley, Gosport, Swindon, Watford and Woking.
What ID do I need to vote, where?
:: Swindon - Your poll card, or if it has been mislaid, photo ID such as a driving licence or passport
:: Watford - Your poll card, or if it has been mislaid, photo ID or a valid debit or credit card
:: Woking - Photo ID, such as a driving licence or bus pass
:: Bromley - Photo ID or two forms of ID, including one with your address on
:: Gosport - Photo ID or two forms of ID, including one with your address on
You can also apply through your local authority for an "electoral identity letter".
The "electoral identity letter" costs nothing and just needs to be applied. Contact your local authority for further details.