“How can I unlock my old MacBook without access to linked email?: i have a very old mac book laptop, I can't get into it and it's linked to a very old uni email which isn't in use. How can I get in? I'd be happy for everything to be wiped if necessary.”
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No success? Give Apple a call, and see if they can assist you over-the-phone.
Screenshare with the Apple Rep:
To easily show the Apple Rep what is going on here, request a prompt for a screensharing session with the Apple Rep. That will allow them to see this firsthand, and upfront. Show this user through screensharing your Mac. Show them any paperwork and your screen or hover over something, through screensharing your iPhone.
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