In message , at 15:41:45 on Wed,
19 Sep 2012, Clive remarked:
The first question Tesco ask you is "Have you brought your own bag",
at which point you can put it on the bagging area and it re-calibrates
the weighing scales.
Not in my neck of the woods. It says have you brought your own bags,
press yes, put them in the bagging area and it immediately says unknown
item in bagging area.

I went to Sainsbury later, and they ask the same question as Tesco. Very
first screen, and this time because I only had one of my own bags the
system accepted it.
--
Roland Perry