Hi,
If you are supplying digital services from overseas to individuals in the UK then the important aspect which will determine the place of supply of the service is the country in which the individual belongs. If you have confirmation that the customer is in the UK then VAT must be charged.
You can see the guidance below and the type of evidence you may need to get and keep to show where your customer belongs:
How to determine whether your customer is a business (taxable person) or is a private consumer
As you raising invoices to individuals in the UK then a VAT invoice is not necessary. You can see the guidance below which explains when a VAT invoice needs to be raised.
VAT invoices
Thank you.