Ugh. I hate Hotmail's new separate People section - it exists outside the realms of common sense.
Sorry mate, after checking the sent item, the answer is yes...though not intentionally, if I manually added everyone as a BCC there wouldn't have been an issue as your old email no longer existed, however I send the spreadsheet via a bulk "Fantasy Footy" setting which under Hotmail's new separate People section has caused the issue.
Previously updating a contact's details didn't matter as the name not the email was linked to the group, under Hotmail's new "awesome" way of doing things, the reverse is apparently true (or possibly just if it has received mail before) - so when I updated your contact details, I had a "Vandrs" contact in my normal listings with your correct address...and a vandrsxr contact with your old email that existed solely in the Fantasy Footy group.
I apologise for any inconvenience, I probably should've double checked things but having had no issue with updating contacts linked to groups in the 10 years previously, it wasn't something that occurred to me at the time.