Okay. So make passports free to apply for and renew, and make the application process possible from every Post Office, including on Saturdays. And maybe then that will be a fair way to require voter ID.
You need a passport to protect yourself from identity theft. Britain is quite a unique country, where this shit happens regularly. Back in my home country no large financial transaction can go without solicitor approval and you being in person with your valid passport. But here you can see a post about wife/husband secretly opening credit cards in the name of their partner on Reddit every bloody month! All you need to know is their name and residency address for the last three years.