This type of scam is nothing new, and it as been doing the circuits for quite a while. 1&1 have recently notified some of their subscribers about recent problems with one of these scamming companies and domains registered through 1&1.
If you go to the Nominet website, you can obtain information about any domain registered with them. Perhaps a worthwhile suggestion to check this out, and see if your domain is about due for renewal. If so, get things moving if you want to retain the domain,and contact a reputable or your previous domain name supplier.