From everything I've read, the Replica project was about proving that, if necessary, the UK could build a next gen stealth aircraft - the most important bits to prove independance on being the surface coatings and materialst. I think this must tie in to more of their initial work as part of the Northrop Grumman team for JSF down selection, certainly the airframe shape has plenty of NG team features. I wouldn't be surprised if this wasn't much more than plywood beneath the skins. There are other birds furthering knowledge now.
I suppose there are others in here not allowed to share their knowledge on this, and this is just my opinion from what I've seen.