Perhaps some already know this, but feedback ratings on UK site are clickable (and results is the filtered by that criteria).
For example, I am looking at my FB on UK site:
http://feedback.ebay.co.uk/ws/eBayISAPI.dll?ViewFeedback2&userid=dipmicro
Now I click on my negatives:
http://feedback.ebay.co.uk/ws/eBayISAPI.dll?ViewFeedback2&userid=dipmicro&iid=-1&de=off&items=25&which=negative&interval=180
Interestigly, when changed ".ca" instead of ".co.uk" in above URL, the filter continues to work.