To add my 2p, I was once in a job with a 3 month probationery period, during which time either side only needed to give one week's notice.
As a self employed person these days, I have no notice period, and if I 'sack' a client, I try to ensure that everything is up to date, including monies due, before doing anything about it.
Jackie, Peer Moderator
www.iqps.org