Keep in mind that something gluten-free in one country can have gluten in another country. There are at least a few conflicting products in the US vs. Canada, so I'm sure it's the same in the UK vs US.
I found the UK Cadbury site's gluten-absent list. There are several Cadbury Eggs on the list -
http://nutrition.cadbury.co.uk/epages/Stor...p;x=17&y=15This is their statement of what they consider gluten-absent (emphasis mine) -
Gluten absent
These products are suitable for people who suffer from Coeliac disease as they meet the current standard for gluten absent, as set by the international body, Codex Alimentarius.
Products which may contain traces of wheat are also excluded from the gluten absent list. The list is also available from www.coeliac.co.uk It also takes into account of the definition for cross contamination.
I'd say that it's probably gluten-free. When they bring up the Codex standards, it always makes my stomach churn because gluten is actually allowed under those standards. BUT, since they also say that they don't include products that may contain traces of wheat on their gluten-free list, it makes me a little nervous. Notice that they say "traces of wheat" not "traces of gluten".
Nancy