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 scratches 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 scratches or a jockey change, they ride in 2 races at a specified meeting, your bet will be deemed no action.
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.