Hi George, i am ccing your accountant Georgia to be in the email thread.
Kindly note that the UK has now exited the EU so whether or not VAT applies it depends on the specific transaction. So please specify what you mean by marketing: i.e facebook / instagram ads/ or something else like content creation etc. The answer will undermine the specific VAT treatment of your UK sales invoices so please elaborate on the details to the extend possible.
As far as the Italian invoice is concerned because it has an EU VAT number no vat is due and it has to be recorded via the VIES mechanism as discussed.
So Georgia please follow up on this.
Thank you,
Finhub Accountant