Thank's for all your responses. I will not be going down the the length of string and a 'tug' route, and the internet extension,cell phone, and powerline adaptors etc, I would struggle with. I have 'stable door ' access to my shed, lower half can be bolted inside, and the top half kept closed by a strong ball catch, so I am not 'locked in', but my wife suffers severe athritis in the hands and pulling on the door is something she avoids. I do not see using a bell push is demeaning, its used to summon someone to the front door, and in many establishments to obtain counter service. I like Rod's solution, and that is what I will be getting, and when tea and cake is being served, all my wife has to do is push the button and I will come running. Thanks again, regards, Lynne.