Millipede. A bumper turnout at Cliffe Castle (Keighley) inaugural indeed.

Filtering the results on the last column, looks like over 100 (around 117 at an estimate) of the runners were doing their first ever parkrun, only 6 of whom were registered with parkrun as being affiliated to a local running athletics club. Many others running being experienced parkrunners of both club and unattached status.

So maybe working both ways in this discussion? 🤔

Were there any local road or fell races on the same day, and did they suffer with turnout I wonder. 🤔 That's the crux.