I have created a list of drivers with dates they have travelled and
where they have fueled up. I want the spreadheet to flag up if the
drivers have fuelled up more than once in a day in red say.

e.g.
Date Location Driver
17/10/06 London John
17/10/06 London Robert
18/10/06 Southend John
19/10/06 London John*
19/10/06 Southend Robert
19/10/06 London John*
19/10/06 Northampton Graham