A DOUBLE killer who had a sex swap and was moved to a women’s jail is divorcing the lesbian murderess he wed behind bars. Deranged strangler Douglas Wakefield, who had the sex change at taxpayers’ expense and changed his name to Tai Pilley, married fellow lifer Thelma Purchase. But now the relationship is over after the married couple had a violent bust-up over 47-year-old Purchase’s close relationship with another female inmate at New Hall prison near Wakefield, West Yorks. Prison bosses moved mum-of-three Purchase to a prison in the South of England and now Wakefield, who became best pals with...