@MrsT2514 Please let us know how you get on. If you are unable to achieve the most basic process of cancelling a Membership via your account then that is most concerning. Can you perhaps elaborate as to what the problem was? I know that there are many steps to go through with a string of more or less tedious "are you sure?" messages, usually followed by a special price offer, at which stage I usually succumb. But if you are not interested in that and persevere it should let you do it.
