"Inigo Pipkin" featured an old man. Soon after the actor playing the part died, the series was re-named "Pipkins".
Inigo Pipkin was a puppet maker though, it wasn't set in a junk shop.
"Pardon My Genie" was set in a shop, but I'm not sure if it was a junk shop.
What year are we talking Jendouba? The above mentioned were 1970's.
Hello Jendouba. I am absolutely 100% certain that the programme you are thinking of was called Bric a Brac starring Brian Cant. Click here to see if I am right. http://www.imdb.com/title/tt0428095/
I hope that helps you.:-D