The Undateables: Charlotte, Richard, Alex and Sam

Revisiting three familiar faces who are still looking for love, and one former singleton who is now engaged and is getting married to his college sweetheart. Charlotte, who has autism, is moving out of her family home and is looking for a life partner. Meanwhile, train-lover Richard from Warwickshire is still searching for someone to share his life with, as is Alex, who has written his own book about autism since last appearing on the programme. Finally the programme catches up with 26-year-old Sam, who is preparing to marry his old friend from college, Vanessa