In message o.uk, Dave
Liquorice writes
On Tue, 27 Oct 2009 00:07:50 -0000, dennis@home wrote:

They wait until the item is on the scales before they allow the next one
to be scanned. It can be a real pain.

This requirement to "weigh" items that don't need weighing
The requirement to weigh everything is to stop you nicking stuff, the
machine knows how much an item should weigh and it stops until it can
see that weight on the platform before you can scan the next item. Of
course, the obvious scam is to show it a cheap tin of own brand product
(beans for instance) and put the equivalent weight premium brand product
in the bag.
--
Clint Sharp