The latest heart screenings by Craig's Heartstrong Foundation were blighted by no-shows.
Organisers are frustrated by what happened at the weekend, as there were others who could have filled those slots.
Paula Lunt of the foundation told John Moss how many had failed to show up on the Saturday:
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Chance to watch partial lunar eclipse tomorrow
Early birds will see a red coloured moon
Red Devils to descend over Douglas Beach
Parachute display was due to be part of Classic TT celebrations