RealAnastasia:
It sounds to me like while the process of extracting the raw material of the DNA from the tooth was done, the process, the sample was not actually processed because the procedure was not paid for and therefore the people at Aldermaston had no information to report. If Dr. Gill in fact had no knowledge of the sample in 1994, pursuing anything more from the English lab would be fruitless.
About those other two teeth, Dr. William Maples died sometime after making that cryptic remark to Mrs. Tammet that 'the evidence is complete': which could have just meant that the laboratory needed nothing more from her. She had also submitted evidence of a collection of letters and memorabilia dating from about the time Mr. Tammet was supposed to have 'admitted he was Alexei'. (sounds more like the onset of a psychotic break brought on by the strain of illness after a difficult life and a few broken marriages of convenience that did not work out.) The extractions may not even have been done there either because of no payment from Mrs. Tammet. Conspiracy is not likely here in the least.
I would not hold my breath. If the Wiermann family did step forward and say anything more about their eccentric great-uncle, DNA testing would not even be necessary.