If the ups and downs in the party's fortunes had occurred uniformly across the country, Mr Cameron would have won only 291 seats rather than the 307 he is likely to have obtainedonce the delayed election in Thirsk and Malton is held later this month.
Getting these is tricky, but the researchers hope that cryopreservation that is, deep-freezing at extremely low temperatures will preserve them indefinitely, once they have been obtained.