Just got an email saying
Dear [my email address]
This e-mail has been sent to you by Halifax UK to inform you that your account will be deactivated within the next 24 hours due to several unsuccessful login attemps on it.
To prevent this to happen please login securely to our activation link below:
[link]
OK then... needless to say I don't even have a Halifax account!
Just thought I'd post it here anyway in case anyone had the same.