Who does he have the email account with? @hotmail.co.uk or @yahoo.co.uk or who?
Webmail only or on his pc?
Can he still login to that account? (have they changed his password so he can't login?)
Can he still send and receive?
If he can still login to his account on the WebMail Server then he first needs to look at his details and check the alternative email address he has set to send password changes to. No good him changing his password if it is sent to someone else. Also need to check if they have set to have a copy of all emails forwarded to them.