There's an e-mail in my inbox titled "Dear (my e-mail), final notice, you are eligible for tax refund of xxx GBP". It's got an attachment as well. I've not opened the e-mail yet.
Do HMRC send emails like that if you're due a tax rebate? Last time I had a tax rebate - about 10 years ago - HMRC sent me a cheque in the post.
I'm feeling suspicious.