I had a disappointing time at the roost Tuesday (9th February,) there were only thirteen (13) birds in the roost that included one tagged bird Black G and one other adult. There were eleven (11) sub adult birds.
Presumably, the tagged birds observed previously have either returned to their breeding territories or found alternative roosting areas. Ornithology is not an exact science.
As is frequently the case, the disappointment had already been offset by watching a displaying pair of Goshawk prior to reaching the vantage point to observe the roost.
Shortly afterward leaving the roost site, a pair of Tawny Owls observed perched on a branch sticking out from the hedgerow was a bonus.