Big thanks to Helen and Jason for all your help with this bug!

We've now got an acceptable workaround that was proposed by Jason.

>I'm going to recommend that you create a package with your own components in it
>that are sub-classes of mine which will allow you to easily introduce code
>that will take effect globally in your application.

We created a TIBOStoredProc descendant component which we are now using in place of TIBOStoredProc which simply overrides the ExecProc method and calls Prepare before calling the inherited ExecProc. This has seemed to fix (or rather bandage) the problem nicely!

Thanks again for all your help :o)
Ben Daniel