The irony was that it was a footgun move for them given their demographics. Most young people of voting age are likely to have a driving license, if only so that they can drink. Unfortunately for the Conservatives these folks are unlikely to vote for them. Many old people, on the other hand have no current driving license or passport and are unlikely to carry their expired ID around with them. These were conservative voters, but two trips to the polling both may be a bit much for them.