eBay UK and eBay Ireland will no longer allow knives, other than cutlery, to be sold.  The changes to what defines a legal knife have become more and more complex, so to ensure the safety of eBay UK and eBay IE members, eBay has taken this further step.  Details regarding this change as well as when it will be in affect will be posted shortly in eBay UK Announcements.  Here is the original announcement:

We wanted to inform you of a change to our policies regarding the sale of knives.

All knives except cutlery will be banned from sale on eBay.co.uk and eBay.ie.

This will impact UK, Irish and international sellers who currently list knives for sale to buyers on the eBay.co.uk and eBay.ie sites.

Over the last year we have made several changes to our policies regarding sales of knives and also Samurai swords to ensure that only legal knives are available on the UK and Irish sites. However, the criteria for what constitutes a legal knife are increasingly complex, and this step is necessary to help further protect our members and provide them with the highest safety standards.

We will be updating this AB post shortly to ensure that any sellers of knives have full notice, details and timings for the changes.

Thank you for your support in continuing to make eBay such a vibrant and trusted marketplace.

Regards,
The eBay Team

http://www2.ebay.com/aw/uk/200902091834232.html