GEC-Marconi is obviously applying highly original minds to identifying additional markets for its electronic tagging devices: according to the Daily Telegraph, the company has offered its wares to Humberside Social Services who apparently find it difficult to keep tracks on particularly intrepid senior citizens: although Age Concern has made vague murmurings about individual dignity, it seems likely that the council will be nodding through the tag-a-Granny plan before the end of the month.