I have to thank Kevin Chieff (ACT! guru) for pointing me to this link on how to tell the difference between versions of Microsoft SQL 2005 - and the MS page it points to re the SERVERPROPERTY (Transact-SQL) command.

The number of times I’ve had to work out just which version of SQL is running is amazing. The difficulty in doing so is amazing. There ought to be a simple utility that does it all.

So the two links above will get used a lot in conjuction with my previous post re determining SQL versions.