My client has undertaken work for a charity and was verbally advised that he did not have to charge VAT. A certificate apparantly confirming this was provided, though it did clearly state that it was the suppliers responsibility to ensure that this advice applied to him. The invoices were picked up during a VAT inspection and my client has, of course, been instructed to charge VAT on the original invoices. The customer is refusing to pay on the basis that my client should have ensured that his supply was indeed non-Vatable. We are claiming that the error was made in good faith and my client was acting on the advice issued by the customer. This would seem a fairly straightforward case, but as my client intends to issue a claim shortly, we wanted to ensure that he was on solid ground in demanding the input tax. How wouyld the experts progress this matter?