Looks like UKReg were intruded a little while back. I got this email earlier asking me to change my passwords just in case.
Anyone else with them should also do the same by visiting their website.

We are writing to inform you that we have recently discovered evidence of a network intrusion involving a Fasthosts server. We have reason to believe that the intruder has gained access to our internal systems, and that this may have in turn given them access to your username and some service passwords.

We have since closed the vulnerability through which access was gained, and have taken steps to ensure that this cannot happen again.

We therefore recommend, as a precaution, that you now change the control panel login password on your account.