Advert from 7th December 1950:
They were at 32 Bellhouse Road
Photo here: http://www.picturesheffield.com/frontend.php?keywords=Ref_No_increment;EQUALS;u07114&pos=91&action=zoom&id=98779
I had forgotten that one, I had a feeling there were more than one but can't remember where any others were. That one is pictured in this Firth Park post towards the bottom of the page, there is also mention of other shops including "an electronic store which had a record department downstairs" -----------