Like other pet birds, gloster canaries are a social species, so they will want attention and stimulation from their owner.
A lonely gloster canary will not thrive, nor will one that is kept in too small of an enclosure, but these birds can become territorial if housed with other canaries so it is best to keep them separated.
Ideally, a canary's cage will allow them to fly and hop around from perch to perch, contain a nest, water dish, bathing bowl, food dish, and toys.