Although there comes a point in her investigations when Carol Vorderman's eyes fill with tears she manages for the most part to keep a lid on things in tonight's edition of the reality/ genealogy series. Initially, that's because her mother's side of the family seem a jolly lot with a great-grandfather who was an astute businessman and owned the first butcher's shop in Prestatyn. It's not until Vorderman starts poking around in her Dutch father's family that things get a bit more emotional. Tony Vorderman and his wife split up three weeks after her birth and Carol didn't see him for more than 40 years. All she has to go on is a family rumour that her great-grandfather was robbed of the Nobel Prize for science, and that her father worked for the Dutch Resistance during the war, with the fishy nickname "Snoek".