A dad-of-five who suspected his long-term girlfriend was cheating on him swapped her medication for laxatives. Richard Black was caught creeping into the kitchen on a CCTV camera the couple had installed at their Dover home. When confronted by the mother of his children, he first tried to blame her illness on unsafe seafood. But when he appeared at Canterbury Crown Court on Tuesday, the 51-year-old admitted administering poison with intent to annoy. However, he was spared jail, with a judge accepting he had not intended to cause actual bodily harm with the “calculated attack”. The court heard …