The Listed John Turkington Forestry Castletown Stakes (1200m) was one of the few age-group features in the lower North Island that was missing from Lisa Latta’s CV, but the fast-improving filly Platinum Diamond dealt to that unfinished business at Otaki on Friday.

Hawkesbury trainer Blake Ryan is known for sourcing nice yearlings and turning them over at the two year-old breeze up sales, but a Written Tycoon colt purchased from Inglis Easter for $425,000 has remained in the stable and made a winning debut at Gosford on Thursday.