Date format problems after applying Vista SP1

I've installed Vista 64-bit SP1 and when I create a vbscript containing the
following:

wscript.echo "Date is " & DateValue(Now)
wscript.echo DateValue(Now)

Run this and the two results come out differently:

Date is 2/21/2008
21/02/2008

I have UK date format setting but it wants to give me the US date format if
I add text to the output. (If you don't use the DateValue function it still
comes up incorrectly.)

Does anybody else get an inconsistency when your regional settings aren't US
date format?

Thanks!

Alex