Question Author
Don't worry - I've sussed it!
Apparently, it was one of my friends who I don't see very often. Apparently I logged onto Answebank at her house a while back (to show her what a fab site it is). She remembered the site and came back to AB to ask a question and it automatically logged her in as me, as I was the last person on it using her laptop!!!
Only found out when I got a phone call saying "It was me....you know, who asked that question about the Costa del Sol or Turkey..."
Sorted!!!