Kelly Marks, founder of Intelligent Horsemanship and author, is donating her £1,000 Royal Windsor Horse Show prize to the Lambourn branch of Riding for the Disabled (RDA).

Kelly scooped the prize money in the SEIB BHS Pro-am showcase TREC competition at Royal Windsor on 16 May.

The class was introduced at the Royal Windsor Horse Show as a fun, shortened version of TREC — a three-phase equestrian sport that normally comprises orienteering, control of paces and various obstacles that a rider might encounter out hacking in the countryside.

In the showcase event, obstacles included cantering under simulated overhanging branches, weaving in and out of trees, crossing a bridge, loading a horse in and out of a trailer and rein back in a confined area.

Twelve competitors from various equestrian disciplines took part, including dressage’s Spencer Wilton and Laura Bechtolsheimer, show jumpers Tim Stockdale and Robert Whitaker and event riders Dickie Waygood and Lissa Green and riders from the Household Cavalry and the Kings Troop and international TREC.

Kelly led the field with her 15hh skewbald gelding, American Pie, with a score of 101 points.

Three-day eventer Dickie Waygood took second on Starlight Sylvester (89 points), and TREC GB team member Anna Weston was third with Hambourne (85 points).