There was a home winner at Central Park Stadium on Saturday when Ashford’s Elizabeth McNair completed a one-two in the Arena Racing Company Kent Derby. The £12,500 competition was won by Queen Joni ahead of her cousin King Memphis and followed in the paw prints of FromPostToPillar, who won the competition for the McNair family and the KSS Syndicate 12 months ago. It was a third Category One success for Queen Joni in only six months after she landed the Produce Stakes at Swindon in September and the BGBF British Bred Derby at Sheffield in December. She crossed the line in 28.91sec – her fastest…