Only brain, spinal cord and intestine have so far proved positive. Some of the experiments are hugely expensive as compared with those in basic science. This experiment is still running but will be completed by the end of the year. Other research, under Bob Will, head of the CJD Surveillance Unit, also in Edinburgh, was stepped up in 1990. Will's unit recently identified the new variant form of CJD that precipitated the present crisis.
Answers are probably no, and definitely yes, respectively.
There have been some failures. For example, we still do not have a transgenic mouse engineered to contain the cattle prion gene. Also, more effort should have been put into diagnosis, although this is not an easy topic to study. As far as potential cures are concerned, we are nowhere. By and large, however, British researchers are doing good work with the resources available.