How come no one ever saw sheridan on keeping up appearances?

In the British sitcom "Keeping Up Appearances," Sheridan, the son of Hyacinth Bucket, is often mentioned but never seen. This choice adds to the humor of the show, allowing viewers to imagine his character while emphasizing Hyacinth's obsession with social status and her desire to present a perfect image to her neighbors. His absence also serves as a running gag, highlighting the contrasting dynamics within the Bucket family.