Brilliant - never noticed that little SSMS 'feature' before! Well that's got my "command" where i want it.

Needless to say it runs fine from the SSMS window using 'exec'...

Many Thanks Gialuca for the link - unfortunately I see a caveat for clusters - Curses!!

"Changing the edition of a SQL Server 2008 R2 failover cluster is limited. The following...

Thanks to All for these replies.

As it happens I've dodged the bullet by deciding to do a straight to upgrade to 2005. Didn't need the second instance in...