Apologies guys, not explained very well, tried to simplify but badly.
Try again.
Cells B2:W2 have a date in the format 01/01/2011
Cells B3:W3 have the =B2 etc and custom formatted ddd
Cells B4: W4 have a customer ref: No.
I want B3:B4 to be in a formatted colour if the date in cell B2 is a Saturday etc.
Thanks Jase