I worked as a poll clerk or presiding officer at elections for over 40 years, until a few years ago. It often struck me that a system entirely based on trust was open to fraud. I just had to ask each voter for their address and name, then mark the register and give them their voting paper. How did I know if they were really that person? They didn’t need to show their voting card. The only instances of recorded fraud are where either voting staff or tellers outside recognised the person as someone other than they purported to be - not very likely to happen. There could be widespread ‘personation’ that we just don’t know about. I often worked in polling districts with many foreign students (who are allowed to vote in some elections). They would often walk in and immediately proffer their ID. They were surprised when I said I didn’t need it. But how do you know I’m who I say I am, they said. Oh we take you at your word, I’d say - they just looked amazed.
I think showing ID is a good idea - fraud in everything else seems to be increasing, why not in voting. Most people over retirement age get a free bus pass (I certainly do and I think this is widespread across the UK) with their photo on which can be used as ID, so they don’t have to have a passport or driving licence. As for the immunosuppressed lady (as I am myself), of course she should have got herself a postal vote - what on earth was she doing going out to vote in a mask? Ridiculous! As for the argument that she should be entitled to do whatever she wants and we should accommodate that no matter what, I just despair! If we want to live in a civilised society, we must accept that there are rules we need to abide by and this one is a very easy one to comply with.