timed a bird from carntan 2 years ago at 11 29 59 only bird in the club that night and yes i flag them very late at night sue so it does work but you have to build up to it letting them out 2 hours before dark to start with till they are landing on the loft in almost total darkness ps i also let them out at 4 in the morning to get them used to getting up and flying early in the morning dont get much sleep in the run up to the big races late nights early mornings self inflicted lol