Hi again Jason
Sorry about that, I guess i was getting too carried away with editing the page.
I've put the First Name field back in now and its working again - up to the point where it goes to the SagePay portal, then it comes up with the following (missing Currency) error again...
This transaction attempt has failed. We are unable to redirect you back to the web store from which you were purchasing. The details of the failure are given below.
Status Detail: 3045 : The Currency field is missing.
Hopefully this will be that last time I bother you :)