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Like what? There aren't any electronic systems that aren't anywhere close to as secure and secret as bits of paper.
Well what would be better would be like the US system where the ballot papers are generic and you fill in your own details rather than having to have the specific paper with a printed code on it. Hell, they could even just send me a PDF of my own paperwork and have me fill it in and post it back. Perversely they accept that for a proxy vote, just not for an actual vote (as obviously the person using my proxy has the right paperwork).
Given >5M Britons live abroad, I'm surprised how ropey the postal vote stuff is. Mine arrived in the post today and I sent it back but given it usually takes 3-4 working days to get stuff to the UK even in Europe, there's no buffer. They really should find a better system.