I’ve just spoken to my bank’s fraud department about this charge. They tell me it refers to charges made by my previous bank.
When you change banks under UK rules, the new bank and the old bank enter into an agreement that means the old bank can make payments and forward the cost to your new bank for up to thre years. So, if during that time, someone needs to take a payment but they only have your old account details to process the payment, the transaction will be honoured by your old bank and forwarded to your new bank. It will then appear on some bank’s statements as VIS INT L followed by a number.
This information. Was provided to me by Nationwide Building society