Sorry that you received the email. I made a mistake on the data selection and included those who had enabled the Nominet Whois Optout which was available for Individual/Personal registrations around 2014.
Only customers who purchased and paid for Privacy will be moved to the new product. Any customers not wanting to be migrated can turn Privacy off within their Control Panel in advance. Those who do not read the email will have an extended period of time to request a refund if the service of Domain Ownership Protection is not wanted.
There is a bug that I have opened reflecting the older free Privacy which you are referring to which we will get sorted - this will not effect charging in these cases as they are not going to be billed anyhow.
Richard.