On Fri, 09 Aug 2013 13:39:30 +0100, charles
wrote:

In article , Frank Erskine
wrote:

_They_ are probably staff shortcuts for their use in case of fire!

don't the customers get emergency exits, too?

No, they are expected to follow the normal route throught the store. 30 minutes
later, if they are lucky they reach what is left of the checkout.


--