I find that my details are on the Dixons Carphone list of customers whose information they have inadvertently shared. I tried to use my right under GDPR to have my personal details deleted. I am told that this is possible but only if I send further personal detail including a copy of my passport! They must be joking (but apparently not)
Methinks the company isn't really interested in meeting their data management responsibilities but is interested in maintaining as large a list of customer details as possible!