'Er indoors (Minder) Chris Warboys (One Foot In The Grave) Sheridan Bucket (Keeping Up Appearances) Monkey Harris (Only Fools and Horses) Nurse Gladys' Mother (Open All Hours)
Charlie (Charlie's Angels) Elizabeth Mainwaring (Dad's Army) Mrs Barrowclough (Porridge) Howard's mum (Big bang theory)
The Invisible man (The Invisible Man) Mr Popolopolopoloplopidus (Eastenders) Dianne (Twin Peaks) Reggie Perrin's Hippo mother-in-law (The fall and rise of Reginald Perrin)
Some very good suggestions also Mrs Norm Peterson out of Cheers. Maris Crane is probably the greatest as they really worked her into the scripts all the time.
Beat you to it fella. The only time she was 'seen', was when she was in the upper bunk in the air raid shelter. You saw her 'shape' sagging through.