I can't see immediately whether or not his will do what I want. Going quickly through the tutorial, this, despite what it says, is the first reference I noticed to use of JS. It seems to indicate that JS will be used for OnWhatever events and for other, unspecified, validation. As I said in the OP, I want to avoid JS, and I fear that this will use JS in ways that I can't predict and will mean that I have to unpick so much that my original plan of a hash would be simpler. If there is more that I should have gleaned from the docs, any pointers would be most welcome.

Regards,

John Davies