The regulatory position in the UK and the rest of the EU is currently complicated and uncertain. But the latest EU cookie advice is as follows. This is part of a European data protection authorities opinion, as reported by the UK Information Commisioner's Office Website, visited on 11 July 2012:
Some cookies can be exempted from informed consent under certain conditions if they are not used for additional purposes. These cookies include cookies used to keep track of a user’s input when filling online forms or as a shopping cart
If you also want to describe the cookies involved, they are as follows:
tms_VisitorID: stores a unique id for the device. This is used to keep track of your shopping, to send/show you offers that relate to the products viewed, so you can be contacted by email if you seem to be having problems, or to help us improve the Website. We will not sell or pass on this information to third parties.
tms_wsip: records whether the device has a modern web browser that supports a more efficient communication channel called "web sockets".