>>It's sorted.
>>
>>You have to start the "SQL Browser Service" on the SQLExpress PC, that provide the UDP function required for named instances. Nice of Microsoft to make that so well known!!
>>
>>Regards
>
>I should have remembered to tell you that. That has caught me numerous times before.

Great tech support anyway. I also like it that Derek is knowledgeable enough to have figured out most of this on his own and just got caught by an unintuitive required step. It seems to me the SQL Browser Service should be enabled by default. Maybe that just isn't the way services are supposed to work.