“V” stands for “void race”, which means that the result of the race was voided for some reason or other. In other words, something happened during the race that invalidated its result. A recent example of this happened at Plumpton racecourse, where the racehorse Wudyastopasking injured himself when attempting to jump a hurdle. As a result, the entire hurdle event was declared void, especially since the other riders couldn’t pass.