From a post on a data breach forum it looks like Guntrader.uk has been breached.

The data that has been pulled out are names, email address, physical address, IP address, phone numbers. Passwords were hashed but not sure if that’s enough to protect them.

If you use guntrader.uk you should change your password and the password on any other site that uses the same one if the hash is unscrambled then your email and password can be used on other sites.