Nominet ,the company behind .uk domain name,have been made aware of a phone scam that targets domain name registrants .
Nominet explained how the scam works .Registrants are contacted by phone by some people who claim to have 3rd party ownership of the registrant's domain name .Then,they ask money or they threaten to sell the domain name on .Whoever receives such calls or any other unsolicited emails regarding your domain names,should first contact the registrar to aks more information .
If you forgot who your registrar is,check out DomainTools.com,enter your domain name in the Whois search box and it will show you details if your registrar .