The named jockey/trainer must have one ride/runner at the specified meeting, for bets to stand. If the named jockey/trainer, rides/trains a runner in fewer races than originally intended due to non-runners or a jockey change, bets placed on this market will stand; unless the number of horses ridden/trained is less than the quoted selection i.e. if you have placed a bet on a Jockey to Ride 3+ Winners; but due to non-runners or a jockey change, they ride in 2 races at a specified meeting your bet will be void.
If the jockey/trainer is detailed as riding or training any horse which they were not denoted to do so in the original day of race Racecard, of the specified meeting; then such winners do not count for settlement i.e. A jockey picking up a winning spare ride during the meeting will not count.